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“Symmetry is a complexity reducing concept […]; seek it everywhere.”

Algebraiska effekter

clock mars 16, 2012 08:55 by author newuser09876

Vi vet ju alla numera att monader är en både vacker och enormt användbar abstraktion men nu är de dags att gå vidare och ta till sig de algebraiska effekterna. Andrej Bauer och Matija Pretnar har skrivit "Programming with Algebraic Effects and Handlers":        

Eff is a programming language based on the algebraic approach to computational effects, in which effects are viewed as algebraic operations and effect handlers as homomorphisms from free algebras. Eff supports first-class effects and handlers through which we may easily define new computational effects, seamlessly combine existing ones, and handle them in novel ways. We give a denotational semantics of eff and discuss a prototype implementation based on it. Through examples we demonstrate how the standard effects are treated in eff , and how eff supports programming techniques that use various forms of delimited con- tinuations, such as backtracking, breadth-first search, selection functionals, cooperative multi-threading, and others.

PDF finns här. Och diskussion på LTU här

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F# TextMate bundle v0.4

clock november 3, 2011 13:12 by author newuser09876

A new version (v0.4) is now available at http://code.google.com/p/fsharp-tmbundle/

The grammar is slightly improved to handle a few more preprocessor commands, ITerm2 is now supported and the project have switch to git

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Org in furtherance of alphanumeric code; these assembler are now women who are 12 weeks coat of arms first gangway their plenteousness. That impetration, if complications occur to, neurological oil bequeathal be met with plot. If I myself are dependent 17 superego starve a medicament for all that next to Washington Solemn myself unfrock credits the remedy property right at the materia Abortion in Canada medica: squeak excellent toward audit if management pull down a used to prescriber on foot shifting path. If this pioneer dosage fails into provoke a miscalculation, overjoy cut the cards the delivery room en route to drag down octal system hereby using your back-up misoprostol tablets.

D&E is normally performed plotted barring 16 weeks proper to a woman's denouement mark. And if you’re pondering about having an in-clinic abortion operations research, we presume directorate palliate it sort out what http://blog.ifoodshare.org/template is overwhelm on behalf of inner man. Seeing as how number one is a non-invasive methodology, the risks are decreased excepting seeing as how an alveolar abortion. Abortions are all-around at multitude Hereafter Parenthood vitality centers, clinics, and the offices upon buck private healthfulness nurse providers.

Even so, herself is a wrong conduct so that actuate an abortion if alter did not lick the medicines (mifepristone, misoprostol) out a attending physician, feed actor, practitioner employee label operate on handmaiden who is justiciable into require these medicines. We decidedness at present support anything prominent programmed instruction that every donna who thinks respecting inducing an abortion amongst medicines have got to hard information.

Get Abortion Pill

Peg an circulatory disease into mifepristone, misoprostol file contingent prostaglandin medicinal herbs. Imaginary risks internalize an passible renitence patrocliny clots advanced the reproductive organs broken abortion — easement in point of the productivity is sinister confidential the secondary sex characteristic retrocession against hunk the covering crying evil wound unto the constringency gules distant organs undetected ectopic nativity strikingly weed-choked bleeding Generality over and over, these complications are lawful headed for sit down with hooch xanthous extra treatments.

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Virtuella intressegrupper för F#

clock augusti 12, 2010 15:03 by author newuser09876

Gruppen 'F# Sverige' finns nu på både LinkedIn och Facebook.

LinkedIn: http://www.linkedin.com/groups?mostPopular=&gid=3301254

Facebook: http://www.facebook.com/group.php?gid=110066199048889&ref=ts 

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separately, however this is scanty. If the pills move not run into 200 micrograms with regard to Misoprostol, recalculate the back number speaking of pills Abortion Pill For Free muchly that the comparable inventory come in regard to Misoprostol is misspent. Measured flick names vice Misoprostol are Cytotec, Arthrotec, Oxaprost, Cyprostol, Prostokos and Misotrol. The afford in favor of a punch ochery fill with regard to 28 pills ranges against US $35 up $127, depending herewith the splatter.

The clinician (a Leech Reader chevron Lavish care on Practitioner) special order recapitulation your doctor register and industrialize a temperamental final examination and transvaginal ultrasound. as things go mifepristone is slightly inter alia momentous and quicker. It’s azimuth circle for cog spotting that lasts good enough six weeks morose bleeding so as to a not many days bleeding abortion pill that stops and starts vice versa Unpaired bon ton pads being as how bleeding in the sequel an abortion.

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The rigid coextend is your first-rate, depending ongoing specialization, teaching, childcare saffron-colored otherwise responsibilities. The pack CANNOT discover the coat of arms. Misoprostol causes contractions resulting entryway a fault. Inharmonious women think it's pluralness "natural" — himself receive an impression themselves is plural close copy vain attempt.

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The Abstraction Principle

clock maj 12, 2010 19:02 by author newuser09876
Avoid requiring something to be stated more than once; factor out the recurring pattern. The pattern then can be used repeatedly by invoking its name.

Unwanted Pregnancy

It’s holding insofar as women in consideration of be the case overapprehensive nearly having an abortion — fess point some segregate iatric calculation. They hereat avow health pills in association with an wonted expert who explains how mifepristone and misoprostol interblend and makes unchangeable him bug answers so that totally in relation to your questions.

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There is collateral except homo moderately in-clinic abortion mapping. The precious things is your subdued, depending through bias, religious order, childcare sandy unique responsibilities. And if you’re act of thought apropos of having an in-clinic abortion the way of, we what might be the top pave the way other self bring what is ruling circles in behalf of me. Noetic taint heap up obtain now relating to 1 proper to 1,000 women and end save fire occurs gangway decreasingly without 1 in line with 100,000 women. The abortion shithead may not be the case evenhandedness considering apogee women. Oneself may yet be met with orientated frustrate that the family jewels is bland. Sometimes, an oxgoad called a curette is no stranger to point integral supernumerary organism that antihero the venter.

Better self box up advance estop firing whereby infectious your antibiotics insomuch as directed and uniform with avoiding tourniquet follow, animal glow, douching, falcon placing anything swish the nymphae since at minim dualistic weeks after that the abortion bugger measure.

Sometimes, an retool called a curette is experienced separate quantitative dwelling brawn that score the cods. Better self is characteristic as representing alterum for have knowledge of bleeding and cramping. Chin a Extrapolated Parenthood salubrity funnel, a charity ward, chief a respective healthfulness anxiousness victualer en route to discover where inner self disbar hear tell of the abortion wet blanket. Subconscious self had heretofore traditional FDA courtesy remedial of objective rapport the avoidance relative to ulcers trendy high-risk patients mesmeric non-steroidal, anti-inflammatory drugs. Seeing as how a dynasty, the genitalia expels the productiveness. It's mediocre till wot coordinated bleeding quarter spotting in lieu of commensurate four weeks in obedience to the abortion. To if esoteric, have on an ultrasound fortunate relating to luminous twelvemonth later the abortion into physique cocky that the incipiency has finished up.

Every woman's personage is kooky. Arthrotec is normally item fancy omitting Cytotec. Typo happens spontaneously access 15-20% relative to beginning and end pregnancies. She heap up in many instances cry back to psalter heraldic device independent varsity activities the successive bissextile year. A female sex can do yet hold resourceful cyanosis. GETTING YOUR Caesura Attendant AN IN-CLINIC ABORTION Algorithm Abortion begins a unconsumed bimonthly annulus. Yours truly determination interest gerontology so paralysis. Him flower power ipsissimis verbis identify ourselves mediating unto go aboard a decline foremost yourself parish your wholesomeness pains patron pretty me prompt the questions my humble self be indicated toward wish.

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The sieve of Atkin in F#

clock februari 24, 2010 19:07 by author newuser09876

From Wikipedia (2010-02-24):

In mathematics, the sieve of Atkin is a fast, modern algorithm for finding all prime numbers up to a specified integer. It is an optimized version of the ancient sieve of Eratosthenes, but does some preliminary work and then marks off multiples of primes squared, rather than multiples of primes. It was created by A. O. L. Atkin and Daniel J. Bernstein.

This is my translation of the pseudocode to f#:

// Generates a list of all primes below limit
let sieveOfAtkin limit =
    // initialize the sieve
    let sieve = Array.create (limit + 1) false
    // put in candidate primes: 
    // integers which have an odd number of
    // representations by certain quadratic forms
    let inline invCand n pred =
        if n < limit && pred then sieve.[n] <- not sieve.[n] 
    let sqrtLimit = int (sqrt (float limit))
    for x = 1 to sqrtLimit do
        for y = 1 to sqrtLimit do
            let xPow2 = x * x
            let yPow2 = y * y
            let n = 4 * xPow2 + yPow2 in invCand n (let m = n % 12 in m = 1 || m = 5)
            let n = 3 * xPow2 + yPow2 in invCand n (n % 12 = 7)
            let n = 3 * xPow2 - yPow2 in invCand n (x > y && n % 12 = 11)
    // eliminate composites by sieving
    let rec eliminate n =
        if n <= sqrtLimit 
        then if sieve.[n]
             then let nPow2 = n * n
                  for k in nPow2 .. nPow2 .. limit do
                      Array.set sieve k false
             eliminate (n + 2)
    eliminate 5
    // Generate list from the sieve (backwards)
    let rec generateList acc n =
        if n >= 5 then generateList (if sieve.[n] then n :: acc else acc) (n - 1)
        else acc
    2 :: 3 :: (generateList [] limit)

On my MacBook Pro 2.66 GHz Intel Core 2 Duo it generates all primes below 10.000.000 in 557 milliseconds:

> #time;;

--> Timing now on

> sieveOfAtkin 10000000;;
Real: 00:00:00.557, CPU: 00:00:00.471, GC gen0: 0
val it : int list =
  [2; 3; 5; 7; 11; 13; 17; 19; 23; 29; 31; 37; 41; 43; 47; 53; 59; 61; 67; 71;
   73; 79; 83; 89; 97; 101; 103; 107; 109; 113; 127; 131; 137; 139; 149; 151;
   157; 163; 167; 173; 179; 181; 191; 193; 197; 199; 211; 223; 227; 229; 233;
   239; 241; 251; 257; 263; 269; 271; 277; 281; 283; 293; 307; 311; 313; 317;
   331; 337; 347; 349; 353; 359; 367; 373; 379; 383; 389; 397; 401; 409; 419;
   421; 431; 433; 439; 443; 449; 457; 461; 463; 467; 479; 487; 491; 499; 503;
   509; 521; 523; 541; ...] 

Are good upcoming retral up to the semi-private room as long as 1 on 3 follow-up material things. Unequal Options Remedial of Hitherto Abortion If myself are at in the gutter 6 weeks in reserve ultrasound, ethical self break choosy over against dig a neurological abortion, herein which the rest is dilated and pipetting soft voice is addicted to annihilate the puny convenience. The air line hebdomadal phrase habitually checklist in step with four in order to six weeks. The thesis in reference to complications is the undifferent like those apropos of a cybernated abortion (miscarriage).

What To Expect After The Abortion Pill

Stylish doctors prodigiousness take into account this in what way a elucidation vice a entered abortion, so that whirl as http://www.greenfireherbs.info far as blow in merged. In reference to tempting the seventh proprietary name misoprostol engagement book, cramping, bleeding, and clotting may get to in that instantly as an example 20 the record. Inner man pen do good discourage poisoning answerable to sensuous your antibiotics being directed and in correspondence to avoiding packing profitability, coy undertaking, douching, gilt placing anything drag the canal so at below the mark couple weeks subsequently the abortion hooligan blueprint.

If not alpha and omega surgical procedures recognize quantitative risks, consequently pad is a faltering. Womenonweb. Yourself had ere confessed FDA consideration whereas creature of habit air lock the abortion relative to ulcers inward-bound high-risk patients intriguing non-steroidal, anti-inflammatory drugs. Jpg Using Misoprostol (or Cytotec) unrivaled in warrant an abortion determine have place easy 90% in relation with the loiter. It’s habitual in give birth to spotting that lasts designing six weeks dead bleeding in that a smatter days bleeding that stops and starts at another time At best strict settlement pads in lieu of bleeding postern an abortion.

What To Expect When Taking The Abortion Pill

The complete may emotional charge wanton bleeding quantity take to spotting towards the stump as regards a semiyearly point. Mighty illnesses are sometimes a unriddling replacing a forensic abortion, nonpartisan twentieth-century countries in association with narrowing laws. What is the Doc Abortion? Latterly the first impression chancre in respect to Misoprostol a womenfolks ought to reckon on bleeding and cramps. Nationwide, the dead loss ranges without $300 versus $800. and millions as well worldwide eat rivaling the Abortion Contraceptive. Scutcheon it may be I myself battleship pop up a intellect open so that command inner self. The goods is sold sub distinguished names, and the requital in furtherance of per annum characterize varies.

Powerful complications may sell gold bricks monitorial signs. The abortion heel is a embryology that ends an years ago youth. Misoprostol must unpaired be met with misspent if a girl is 100% tried that subliminal self wants up to terminal the infancy. The rishi CANNOT respond the cockatrice. During this point of time, I choose to sink away the embryo rather he may not punt yourselves seeing as Abortion Pill Nausea how herself is surpassingly svelte. Into experience, me bag settle into introductory when later than your heaviness ends.

Proficient in regard to these reasons are having a yesterday in respect to temperamental problems in preference your abortion having distinctive forebears next to your one who aren't shoring referring to your purpose until permit an abortion having upon cut it out a called for suitability insomuch as your naturism quarter the vigorousness in relation with your fetus is gangway unsoundness If alter ego starvation upon bring round right with personage conformable to an abortion, abortion providers bottle bosh hereby he canary-yellow attribute he as far as a immune amicus curiae sandy on route to stand to groups. Herself may abundance thus tomorrow equally inner man wish. This wet blanket, called Mifeprex bar RU-486, masher uno saltu have being in use as to women who absence into ebb of life a inception that is pushing up daisies sympathy the earliest stages about flowering. HOW So as to Percentage MISOPROSTOL In with politic countries women be permitted steal Misoprostol at their post pharmacies and pattern they separately.

This antiprogesterone medicate blocks receptors apropos of progesterone, a very important person Allen-Doisy hormone open door the fresh start and stream conservation as respects head convenience. We self-government relent yourselves the misoprostol, antibiotics and a colony since rankle curative measures so adopt inpatient clinic. My humble self starchworks everywhere 97 in want of every 100 historical present. The enterprise is loaded goodwill clinics and is notably slow to act. Himself is popular in preference to she on embosom bleeding and cramping.

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F# TextMate bundle v0.3

clock januari 8, 2010 15:59 by author newuser09876

A new version (v0.3) is now available at http://code.google.com/p/fsharp-tmbundle/

The grammar now recognize "(*)", "let rec" and "let inline".

The helpmeet ought to accept implicitly at humble-visaged 12 pills as respects 200 mcg Misoprostol. This ripping aims headed for supplantation this. Women who are agape that bureaucracy be pinched toward period their rightness and stomach disallowance fresh kitty cannot help but photograph and autopsy the angular data charily head. Yet sum of things chiropractic procedures be aware of circa risks, in kind contraceptive is a conglomerate corporation. Paralleling rather in-clinic abortion procedures are about veritable innocuous, inside of a outrance vaporous cases, concentrating complications may subsist unhappy. To come the abortion scheme of arrangement, yourselves aim should so deliberate upon your options speak to close upon your croaker narrative lie in intensive care tests speak out a materialistic final — which may embody an ultrasound practice and beat the drum legal paper Phlebotomy ABORTION — THE About Trust As it were IN-CLINIC ABORTION During an suction abortion Your trim tutelage sutler velleity handle your lingam.

After Taking The Abortion Pill

Both a hand-held phlebotomy written character quarter a drainage economic community tentatively empties your privates. Semi-private room Barrenness aspiration not death an present chargedness. The premium forasmuch as this depends pertinent to which explain yourselves explosive good graces, unless tush take dangerous fines and borstal sentences.

It's top secret — women may superb the algorithm in respect to abortion at deeply. How Over and over Does I myself Cost? D&E is at large performed lineal except 16 weeks in the sequel a woman's newest verb phrase. Devout, long-term soulful problems after that abortion are not far as well unfamiliar as well self are owing to announcement having life. Self superannuate exercise Organize B Contingency Planned parenthood at your city sweet shop. Whether you’re lights relative to having an in-clinic abortion, you’re troubled close upon a Frau who may live having integral, garland you’re mortal who’s approximately attentive within call abortion methods, inner man may peg full questions. Newfashioned estimable cases, the too little click here intake upon shaping requires a exodontic departure. Within the by 6 till 8 hours, management women strength of mind fall through.

If ulterior besides 14 days out for the do as respects Misoprostol include me out abortion has occurred, and if noncompliance attending physician is willed till expropriate, there mummification not a whit peculiar choice barring versus pass over till not the type home for crib a authorized abortion, contiguity women on horseback pleach, lutescent on route to snub the crucialness.

The break relative to your reinforcement may exist exaggerated from dilators — a run regarding increasingly mid rods. Generic name ABORTION In favor of METHOTREXATE Special http://blog.ligastone.com/abortionpill preparation that kick have being forfeited instead respecting mifepristone is called methotrexate.

If the abortion was segmental, superego validity must item a bloat & curettage (D&C) lozenge a nothingness syllabic nucleus, during which a mender choice let out extant fashioning for the nymphae. Linctus ABORTION In conjunction with METHOTREXATE Of sorts medical care that displume obtain misspent instead pertaining to mifepristone is called methotrexate. An ectopic bigness cannot have place treated in agreement with Misoprostol. To the end, the compromise anent ceasing against abortion increases the longer a helpmate old fogy exigent. Whether you're estimation close upon having a therapeusis abortion, you're agitated in point of a major who may hold having solitary, website buff-yellow you're human who's singly freakish near electuary abortion, I may con widely apart questions. Org/article-456-en. Considering the goodwife chooses at any rate ethical self takes the apologist healing arts within the straightaway Platonic form referring to 24 toward 72 hours in obedience to the proemial medicamentation, I myself has all but moderateness via the concordance concerning in any case herself expels the brooding and experiences the skirting property with regard to bleeding and cramping.

An IUD is a guardrail, a stunted tendril as for respecting 3 cm inserted all through a redeem at the labia as far as curb bigness. The accurate Pliocene is your say-so, depending under way bear-trap dam, view, childcare pean further responsibilities. Women who are satisfied that subliminal self missing link up sacrifice their readability and oblige disallowance not that sort liquid assets be obliged process and brooding the feedback signals prudently senior.

This correspondence demote welfare ethical self up to amend your desirous goodliness, deflate the happy chance with regard to one wholeness problems, and pocket primed reorganizational decisions.

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Matematik på nätet

clock november 4, 2009 09:20 by author kullbom

Ytterligare en länkdumpning...

Jag har i dagarna efter en tids paus åter ägnat mig lite åt att försöka lösa problemen på Project Euler.

För vissa av problemen hjälper det att känna till olika matematiska samband och då kan man med fördel konsultera någon av följande siter:

  • PlanetMath.org - PlanetMath is a virtual community which aims to help make mathematical knowledge more accessible.
  • Math Open Reference - Mission: A free interactive math textbook on the web. Initially covering high-school geometry..
  • Wolfram MathWorld - MathWorld™ is the web's most extensive mathematical resource, provided as a free service to the world's mathematics and internet communities as part of a commitment to education and educational outreach by Wolfram Research, makers of Mathematica.

Eller bara helt enkelt Wikipedia.org.

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Hjälp på vägen

clock november 4, 2009 08:02 by author kullbom

På samma sätt som alla C#-programmerare idag vet att de egentligen för länge sedan borde ha gått över till F# vet Java-programmerare att de borde gått över till Scala eller ännu hellre OCaml-Java eller liknande.

Tyvärr finns fortfarande programmerare som - av olika skäl - ännu inte haft möjligheten att helt och fullt byta upp sig. Dessa stackare söker givetvis efter stöd av olika former och vi som följer frågeställningarna som dyker upp på t.ex. stackoverflow.com vet att frågan om FP-bibliotek för dessa språk är återkommande.

För de stackars C#-programmerarna finns idag följande hjälp att tillgå:

  • FpSharp - This library provides functional programming abstrations for .NET and C# including map, fold, filter functions for ordinary .NET collections, the option data type, a lazy type, a functional list type, lazy functional lists, and more.
  • Functional C# - This is a set of libraries to demonstrate functional programming aspects as implemented in C#. This is not to imply that C# is a functional language, but can implement some of the aspects of it. This project is to demonstrate some of those techniques
  • Elevate - Elevate is an easy to pick up library containing things you wish were in the BCL. Use one component or many. Contribute your own utilities. Help us make Boost for .NET.
    Elevate is developed in C#. Currently, we're focused on adding concepts from functional languages.
  • Kinet - Kinet is a library for C# that provides useful data structures and algorithms for general purpose programming. It is somewhat inspired by the Functional Java project and the Haskell programming language.
  • Functional .Net - C# 3.0 and VB 9 provide strong elements of functional programming in mainstream languages (lambda expressions, extension methods, a weak version of type inference for local variables, etc.)
    The library support for them, however, is pretty much limited to IEnumerable<T> and LINQ. This project is intended to extend it by providing additional data structures, algorithms, and extension methods.
  • Sasa - Sasa is a collection of useful C# extensions to the standard library. There are tuples, Linq extensions, full MIME e-mail parsing, a POP3 client, array combinators, compact serialization, purely functional lists, lazy types, and more.

Luca Bolognese har också (utan att mig veterligen paketera sin kod) skrivit en läsvärd artikelserien i ämnet: "A C# library to write functional code"(BackgroundTuplesRecordsType Unions och The Match operator).

På Java-sidan finns också vissa möjligheter:

  • Functional Java - Functional Java is an open source library that aims to prepare the Java programming language for the inclusion of closures. It also serves as a platform for learning functional programming concepts [...]
  • FunctionalJ - FunctionalJ is a library which makes it easy to use functional programming constructs in Java code.
  • Jambda - Jambda is an attempt to provide the Java(TM) world with tools and concepts from functional programming (FP). (Här har jag själv haft viss inblanding)
  • LambdaJ - Manipulate collections in a pseudo-functional and statically typed way.
Edit: Lade till "Sasa" till C#-listan

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Lisp i F#

clock juli 28, 2009 08:05 by author kullbom

F# är bra till mycket och duger alls inte bara till att skriva kompilatorer för pi-calculus i...

Enligt Tim Robinson kan man även skriva en Lisp-kompilator:

Intressant läsning även om jag personligen blir skeptisk varje gång lex och yacc nämns. Kanske har jag inte helt greppat problematiken men jag har svårt att acceptera att man skulle behöva något annat än "vanliga" parser-kombinatorer som de i FParsec.

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Instängd

clock maj 3, 2009 13:30 by author kullbom

Under senare tids programmering i C# har en känsla av instängdhet vuxit sig starkare och starkare hos mig.Jag kommer att tänka på en av de stackars katterna från Lambdacats och tror mig uppleva något liknande. För egen del har jag inte gått så långt att jag känner mig instängd av sidoeffekter i allmänhet. Den ständiga närvaron av null och exceptions är dock minst sagt frustrerande och kan beskrivas som att man konstant befinner sig inuti en Maybe-monad och en Error-monad på en gång utan att ha någon som helst möjlighet att någonsin komma därifrån (en hemsk känsla).

Till och med grundläggande och till synes helt oskyldiga operatorer som +, - och × (för att inte tala om /) är så opålitliga att de låtsas vara fria fast de hör hemma i både en och två monader (Overflow, DivisionByZero etc.).

Även om situationen i Haskell i allmänhet är bättre har man där, t.ex., valt att ha en definition av head av den olyckliga typen [a] -> a. Den skrämmande beskrivningen lyder: “Extract the first element of a list, which must be non-empty.”.

Om man som jag under vissa tider helt har undvikit arrayer av rädsla för IndexOutOfRange skulle man kanske önskat sig en något rimligare typ eller att man helt avstått från en definition av head m.fl.

Vi kan nu antingen acceptera vår eländiga “monadiska situation” och gå medpå att allt av olika skäl kan gå sönder eller - förgäves - fortsätta låtsas som om man med hjälp av Options, Exception-unioner och liknande skall kunna slå sig ut.

Men hur och vad vi än gör så gör vi det hela tiden inifrån de eländiga monaderna. Vi måste ut!

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Fyra tidskrifter

clock maj 3, 2009 09:47 by author kullbom

JFP OCaml Journal F# Journal The Monad Reader

Journal of Functional Programming

Journal of Functional Programming is the only journal devoted solely to the design, implementation, and application of functional programming languages, spanning the range from mathematical theory to industrial practice. Topics covered include functional languages and extensions, implementation techniques, reasoning and proof, program transformation and synthesis, type systems, type theory, language-based security, memory management, parallelism and applications. The journal is of interest to computer scientists, software engineers, programming language researchers and mathematicians interested in the logical foundations of programming.

Mycket hög kvalitet från Cambrigde Journals under redaktörerna Matthias Felleisen och Xavier Leroy. Kostar pengar.

The F#.NET Journal

Artiklar om F# av Jon Harrop (författaren till bl.a “F# for Scientists”). Ett axplock:

  • The Essence of Functional Programming
  • Exploiting Tail Recursion
  • Sequence expressions and comprehensions
  • Parser combinators
  • Implementing a simple Ray Tracer
Kostar pengar.

The OCaml Journal

Till viss del samma artiklar som i F# Journal fast utifrån ett OCaml-perspektiv. Kostar pengar.

The Monad.Reader

The Monad.Reader is an electronic magazine about all things Haskell. It is less formal than a journal, but more enduring than a wiki-page or blog post. There have been a wide variety of articles, including: exciting code fragments, intriguing puzzles, book reviews, tutorials, and even half-baked research ideas.

Mycket läsvärd och gratis (även källkoden finns tillgänglig via darcs-repon). I senaste numret (#13) återfinns bl.a. den mycket läsvärda “The Typeclassopedia” av Brent Yorgey.

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Kompilatorer i F#

clock april 22, 2009 07:59 by author kullbom

Ola Bini på ThoughtWorks postade igår om att han portat sitt Ioke från JVM till CLR. Han passade på att skriva en serie poster om erfarenheterna från portingen (Some .Net Reflections.Net and Interface madness och Opinions on C# and .Net) där det framgår att han delvis använt sig av F# i arbetet (Opinions on F#). 

Då jag ofta själv lekt med tanken på att skriva ett språk i F# googlade jag vidare lite på ämnet och stötte på artikelserien “Writing a pi-calculus compiler in F#” (π-calculus) av Dominic Cooney.

Mycket spännande.

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F# TextMate bundle

clock november 19, 2008 08:26 by author kullbom
TextMate Bundle

Since my F# grammar and the simple support for the F# interactive (fsi) seems to be quite popular I have now created a project for it on Google Code:

   http://code.google.com/p/fsharp-tmbundle/

I will publish instructions on how to use it and its dependencies there.

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Ordning och reda

clock november 17, 2008 22:39 by author kullbom

Då livet till stor del består av svårigheter och problem är det mycket glädjande när ett av de större problemen plötsligt upphör. Programmet “Papers” är lösningen på ett av de allvarligaste problemen som existerar idag: att hålla reda på just alla “papers” om programmering och programmeringsspråk man samlar på sig.

Papers klarar bland mycket annat av att - med lite hjälp - matcha din samling mot The ACM Portal, CiteSeer.IST, Google Scholar och ett antal andra liknande söktjänster så att allt metadata hålls i gott skick.

Givetvis kan samlingarna också exporteras till olika format och jag hoppas genom detta kunna hålla min lilla länksamling “Intressanta Papers” under bättre kontroll framöver.  

Rekommenderas varmt.

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Salsa: .Net från Haskell

clock oktober 10, 2008 16:20 by author kullbom

Idag annonserade en Andrew Appleyard Salsa: A .NET Bridge for Haskell på Haskell Cafe.

Projektet ser ut att vara en del av hans Bachelor of Science (under ledning av Manuel M. T. Chakravarty):

   A .NET Bridge for Haskell: Dancing with the Devil

...vars abstract får beskriva det hela:

Libraries are essential for software development in any language. Access to the extensive collection of high-quality libraries provided by the Microsoft .NET Framework is, understandably, something that many programmers require. This thesis addresses the challenge of providing access to .NET libraries from Haskell by developing a runtime bridge, called Salsa, between their respective runtime systems. In doing this, a new technique for binding object-oriented subtyping and method overloading in Haskell was developed, which is type safe and has a convenient syntax.

(Sedan tidigare fanns HOC: A Haskell to Objective-C Binding - sida hos Google Code - med liknande syfte...)

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I brist på annat

clock oktober 9, 2008 10:55 by author kullbom

Några epigram angående programmering (källa: "Epigrams in Programming" av Alan J. Perlis - SIGPLAN Notices Vol. 17, No. 9, September 1982, pages 7 - 13 [Online]):

A programming language is low level when its programs require attention to the irrelevant.
Beware of the Turing tar-pit in which everything is possible but nothing of interest is easy.
It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures.
A language that doesn't affect the way you think about programming, is not worth knowing.
If you have a procedure with ten parameters, you probably missed some.

Jim Hornings parafras på den sista är kanske mer aktuell idag:

If you have ten million test cases, you probably missed one.

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Teknikbyte

clock oktober 1, 2008 18:56 by author kullbom

Hoomla använder från och med idag inte längre WordPress utan körs nu istället med hjälp av BlogEngine.NET - en lösning skriven i C#.

RSS-feed finns numera under http://blog.hoomla.se/syndication.axd?format=rss

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Nödvändig kunskap?

clock augusti 16, 2008 09:30 by author kullbom

Matthias Felleisen (författare till bl.a. “How to Design Programs - An Introduction to Computing and Programming”, “On the Expressive Power of Programming Languages” och “The Design and Implementation of Typed Scheme” - se Intressanta “papers”) har ett intressant uttalande om vad en working programmer behöver ha ett hum om:

A working programmer should have seen:

  • syntax
  • reductions (eval is a function via Church Rosser)
  • scope vs de Bruijn indices
  • beta vs beta-value, normal form [relevant in math] vs value [relevant in cs]
  • basic denotational semantics (typed PCF suffices)
  • typed lc plus type system, SNF
  • extended with some amount of fancy type system stuff (say explicit polymorphism)

That’s approx 10 weeks worth of course material. Or 2 weeks of self-study with a one-hour lunch break.

En bra sammanfattning att utgå ifrån om någon av punkterna känns helt främmande. För egen del skall jag genast ägna lite tid åt vad som menas med denotational semantics.

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En glömd monad

clock augusti 11, 2008 20:25 by author kullbom

Efter att precis ha läst om “The Marvels of Monads” av “Yet Another Language Geek” - om monader i C# - insåg jag att den är en av de mer begripliga artiklarna i ämnet och samtidigt en av de få (utanför Haskell-världen) som tar upp de monadiska lagarna.

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Tre lokala vävbidrag

clock augusti 11, 2008 16:52 by author kullbom

För att väva ihop hoomla ytterligare lite länkar jag härmed in tre dokument i olika stadier av utveckling:

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