It's really irritating when people expect their homework to be done on line.
It undermines the effectiveness of the mailing list by trying to take
advantage of other people's good will.
On Thu, 7 Oct 2004 01:18, ldou wrote:
I have a string,e.g. 1245670398, now I want to select two
element from
Just make the function recursive.
There is a simple relation between,
l [a,b,c] and l [b,c]
Tom
On Tue, 10 Aug 2004 14:01, Florian Boehl wrote:
Hi,
I'ld like to generate a list (of lists) that contains all combinations
of natural numbers stored in another list. It should work like a
You're not really doing anything wrong. You're just another victim of
line buffering.
Try this,
import IO
main = do
hSetBuffering stdout LineBuffering
main2
main2 = do
x-hGetLine stdin
putStrLn x
main2
On Mon, 09 Feb 2004 11:06 am, S. Alexander Jacobson wrote:
This code works echos
patty,
what you have written is not a fold. A fold operates over a list. There is no
list in your code, only some sort of tree structure.
foldMusic :: (Pitch - Octave - Duration - a)
- (Duration - a)
- (a - a - a)
- (a - a - a)
- (Ratio Int - a - a)
- Music
If anyone ports this to work with GHC6.0 please let us know.
Tom
On Wed, 5 Nov 2003 09:58 am, Peter Simons wrote:
S Alexander Jacobson writes:
Is there a reasonably efficient Haskell httpd
implementation around that uses poll/select?
There is a web server written in Haskell: HWS-WP
--
In Haskell, data types and contructors must be designated by
names whose first letter is capitalised.
So,
data currency = ...
is illegal.
Instead use,
data Currency = Dollar Double | Pound Double | Zloty Double | Euro Double
Above are four data constructors and they can be used to contruct
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I still want to use HaskellDB (or at least the relational calculus part of
it), so I was thinking of splitting it into two pieces: a library that
submits SQL queries and returns the results (database interface), and a
library that constructs
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I don't see that the contibutors files are fundementally different.
- From what I understand, it should be possible to write a
generic function,
importCSV :: FilePath - IO [ (String,String) ]
where the 1st value is a field name and the 2nd
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Is there any reason why
show :: String - String
is not equivalent to 'id' ?
At the moment,
show one = \one\
which leads to problems because it often
requires String to be treated as a special case,
rather than just a member of Show.
Tom
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Sorry,
I've worked it out. Didn't read the docs properly as usual.
Tom
On Thu, 31 Jul 2003 04:20 pm, Thomas L. Bevan wrote:
Here is a copy of all the files I am using to try to export a Haskell
function.
This compiles but produces a executable
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Could someone give me a command line example of how to link a C programme
using functions exported via GHC FFI?
I've compile C object files using an FFI function but can't for the life
of me work out what arguments to pass to the compiler to make
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Hi,
I'm struggling to write the following function in Template Haskell.
I have a phantom type,
data HTMLPage a = HTMLPage FilePath
This type points to an HTML file, where 'a' refers to the return type of
the posted form.
So, mostly, I would
] ]
vars = [ var $ show n | n - [1..i] ]
So, I can now define a function f,
f :: [String] - (Int, Bool)
f = $(cast 2) . $(listToTuple 2)
but I can still see no way to infer the size of the tuple purely from the declared
type signature.
Tom
On Wed, 2 Jul 2003 11:56 am, Thomas L. Bevan wrote:
Hi
Strange. I have used this form many times without difficulties.
Perhaps, it is a platform-dependant bug.
Tom
On Fri, 13 Jun 2003 03:33 pm, Filip wrote:
Hi,
I have function
f:: a - b
and I need something like this:
myaccept:: Socket - IO ()
myaccept g = do a - accept g
Hi,
How can I take some input and convert this into a
PortID ?
I don't quite understand why the constructor
PortNumber doesn't have the signature
PortID = PortNumber Int | ...
Instead it is
PortID = PortNumber PortNumber
where PortNumber is not a member of the Read class.
Tom
Sorry,
I've just worked it out.
PortNumber is an instance of the class Enum
so we can use
toEnum :: Int - a
Tom
On Tue, 3 Jun 2003 05:25 pm, Thomas L. Bevan wrote:
Hi,
How can I take some input and convert this into a
PortID ?
I don't quite understand why the constructor
PortNumber
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I've never been very clear on this.
As I understand it, Andrew's code specifies a Compound class where the type
the compound determines the type (and consequently class) of the value of
decompose c.
In Ferenc's example, the Compound class specifies
Hi,
I've been working through the source code of Andy Gill's Html library for my
own edification.
Andrew makes the following definitions.
\begin{code}
instance (Show a) = Show (BlockTable a) where
showsPrec p = showsTable
type TableI a = [[(a,(Int,Int))]] - [[(a,(Int,Int))]]
data
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