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Published on 2010-05-22T21:58:43Z
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I am trying to do following:
10 ** length xs * x
but I get:
No instance for (Floating Int) arising from a use of `**'
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Trying to learn Haskell. I am trying to write a simple function to remove a number from a list without using built-in function (delete...I think). For the sake of simplicity, let's assume that the input parameter is an Integer and the list is an Integer list. Here is the code I have, Please tell me…
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I'm trying to use Haskells Data.Heap module, but I'm incapable of even using it with integers. The only heap I've been capable of using is "empty", which does not take any arguments.
Later on I'll figure out how to instance for my needs, but for now I'd be glad if I was even able to test it with…
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There has been some intermingling of Scala and Haskell communities, and I have noticed now and then people commenting on stuff that's supposed to be easy in Haskell and hard and Scala. Less often (maybe because I read Scala questions, not Haskell ones), I see someone mentioning that something in Scala…
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I have problems installing ghc-mod on my linux machine. cabal worries about "happy" not being available in versione = 1.17:
$ cabal install ghc-mod
Resolving dependencies...
[1 of 1] Compiling Main ( /tmp/haskell-src-exts-1.14.0-1357/haskell-src-exts-1.14.0/Setup.hs, /tmp/haskell-src-exts-1…
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fibs :: [Int]
fibs = 0 : 1 : [ a + b | (a, b) <- zip fibs (tail fibs)]
This generates the Fibonacci sequence.
I understand the behaviour of the guards, of :, zip and tail, but I don't understand <-. What is it doing here?
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I've been led to believe that casting can, in certain circumstances, become a measurable hindrance on performance. This may be moreso the case when we start dealing with incoherent webs of nasty exception throwing\catching.
Given that I wish to create more correct heuristics when it comes to programming…
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Hi all,
i want to cast from upper class pointer to lower class i.e from the base class pointer to derived class pointer.
Should i use "Dynamic_cast" or "reinterpret_cast"? please advice me
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PHP, as most of us know, has weak typing. For those who don't, PHP.net says:
PHP does not require (or support) explicit type definition in variable declaration; a variable's type is determined by the context in which the variable is used.
Love it or hate it, PHP re-casts variables on-the-fly…
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I am using ASP.NET MVC2 and Entity Framework. I am going to simplify the situation a little; hopefully it will make it clearer, not more confusing!
I have a controller action to create address, and the country is a lookup table (in other words, there is a one-to-many relationship between Country…
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Since PHP has no custom-class type-casting, how would I go about doing the PHP equivalent of this Java code:
CustomBaseObject cusBaseObject = cusBaseObjectDao.readCustomBaseObjectById(id);
((CustomChildObject) cusBaseObject).setChildAttribute1(value1);
((CustomChildObject) cusBaseObject).setChildAttribute2(value2);
In…
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