Gregory Crosswhite wrote:
You're correct in pointing out that f uses memoization inside of itself
to cache the intermediate values that it commutes, but those values
don't get shared between invocations of f; thus, if you call f with the
same value of n several times then the memo table
On Thu, Jul 8, 2010 at 5:30 PM, Angel de Vicente ang...@iac.es wrote:
Hi,
I'm going through the first chapters of the Real World Haskell book,
so I'm still a complete newbie, but today I was hoping I could solve
the following function in Haskell, for large numbers (n 108)
f(n) =
Currently, Haskell have transactional arrays in
Control.Concurrent.STM.TArray implemented as Array i (TVar e)
which is array of transactional variables. But what if I need to
place an array into TVar itself? This is something like TVar
(IOArray i e), but with ability to read/write array elements
On Fri, Jul 9, 2010 at 7:16 AM, Emil Melnicov emilm...@gmail.com wrote:
writeTVector :: TVector a - Int - a - STM ()
writeTVector (TVector t#) (I# i#) x = stm $ \s1# -
case readTVar# t# s1# of { (# s2#, (MutableArray a#)
#) -
case writeArray# a# i# x s2#
Hi,
thanks for all the replies. I'm off now to try all the suggestions...
Cheers,
Ángel de Vicente
--
http://www.iac.es/galeria/angelv/
High Performance Computing Support PostDoc
Instituto de Astrofísica de Canarias
On Friday 09 July 2010 01:03:48, Luke Palmer wrote:
On Thu, Jul 8, 2010 at 4:23 PM, Daniel Fischer daniel.is.fisc...@web.de
wrote:
On Friday 09 July 2010 00:10:24, Daniel Fischer wrote:
You can also use a library (e.g.
http://hackage.haskell.org/package/data- memocombinators) to do the
I notice in algebraic data defined with named fields, you can use the
same name inside different constructors and then apply it to any data of
that type.
data Vehicle = Car { ident :: String, wheel :: Circle }
| Plane { ident :: String, stick :: Line }
f :: [Vehicle] - [String]
f
Michael Mossey m...@alumni.caltech.edu writes:
I notice in algebraic data defined with named fields, you can use the
same name inside different constructors and then apply it to any data
of that type.
data Vehicle = Car { ident :: String, wheel :: Circle }
| Plane { ident ::
A simpler solution might be Facebook's thrift [1]
This is a very interesting solution. I'll investigate Thrift further,
but it may wind up being what I do. Does anyone know how solid this
code is in Haskell?
the Java binary directly from Haskell using System.Process and friends, and
rather
Hi,
Is there a particular reason Float, Double, etc do not have instances of
Data.Bits in the standard libraries? I note the Haskell 2010 report doesn't
include them either.
In fact, I'm not actually sure how you'd implement the instance for floating
point types without having some kind of
From: Daniel Cook danielkc...@gmail.com
Hi,
Someone has written a large Java library (QuickFIX/J) which speaks a
gnarled, ugly protocol (FIX). There don't appear to be any FIX
protocol libraries in Hackage. I need my Haskell program to talk to a
3rd-party system that only speaks FIX.
On 9 July 2010, at 08:13
Felipe Lessa felipe.le...@gmail.com wrote:
I guess the only problem lies with writeTVector. I don't know much
about STM implementation details as well, but reading the code for
writeTVector I can't see how it could be rollbacked. I.e., should
something with
On 7/8/10 21:36, Stephen Tetley wrote:
Hello
I suspect you will have to choose single examples for each of the
patterns/ abstractions you are interested in.
Doaitse Swierstra's library UU.Parsing is the originator or the
Applicative style. Its latest incarnation is the library
uu-parsinglib.
Hi,
Has anyone used hs-dotnet (http://haskell.forkio.com/dotnet/) with
Mono on Linux?
Cheers,
- Dan
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Sam Martin sam.mar...@geomerics.com wrote:
Is there a particular reason Float, Double, etc do not have instances
of Data.Bits in the standard libraries? I note the Haskell 2010 report
doesn't include them either.
In fact, I'm not actually sure how you'd implement the instance for
floating
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Hash: SHA1
On 7/8/10 22:25 , Alex Stangl wrote:
1. I.E. and e.g. should be followed by commas -- unless UK usage
differs from US standards. (Page 3 and elsewhere, although FFI chapter
I don't think I've ever seen them *followed* by commas. Preceded, always.
2010/7/9 Ertugrul Soeylemez e...@ertes.de:
Sam Martin sam.mar...@geomerics.com wrote:
Nobody would really need the operations (we have integer types and
UArray Int Bool for bit manipulation), and they would most likely be
very slow.
They won't be slow using SSE2 or something. I can see where
On Fri, 09 Jul 2010 10:07:06 -0400, you wrote:
I don't think I've ever seen them *followed* by commas. Preceded, always.
In American English, they're always followed by commas, and preceded by
comma, semicolon, dash or left parenthesis, depending on the specific
context.
Examples from various
Some operations wouldn't make much sense with Float, for instance the
'complement' function. What should it return? Also note that bit
manipulation functions could cover only a small window of the value
range. So it could happen that x .|. y = x, even though y is nonzero.
Also rotation
2010/7/9 Sam Martin sam.mar...@geomerics.com:
Some operations wouldn't make much sense with Float, for instance the
'complement' function. What should it return? Also note that bit
manipulation functions could cover only a small window of the value
range. So it could happen that x .|. y =
On Thu, 08 Jul 2010 09:48:34 -0700, Daniel Fischer daniel.is.fisc...@web.de
wrote:
On Thursday 08 July 2010 18:24:05, Ben Millwood wrote:
On Thu, Jul 8, 2010 at 3:45 PM, Daniel Fischer daniel.is.fisc...@web.de
wrote:
Well, I made the suggestion of emitting a warning on instance
On Fri, Jul 9, 2010 at 16:23, Steve Schafer wrote:
On Fri, 09 Jul 2010 10:07:06 -0400, brandon s. allbery wrote:
I don't think I've ever seen them *followed* by commas. Preceded,
always.
In American English, they're always followed by commas, and preceded by
comma, semicolon, dash or left
Hi Martijn
I think you are right there - the tech report I linked to does credit
the interface to Niklas Röjemo, so I shouldn't have used the word
originator (as you suggested popularised would have been better).
Unfortunately the thesis doesn't seem available on the web so I can't
see how much
1) How stable/defined is FIX?
Not very. There are several protocol versions, various vendors have
their own custom message types, there are service packs released
fairly regularly updating the protocol for new message types, etc.
2) How large of a subset of FIX do you use?
I will be using
begin Edward Kmett quotation:
The result is considerably faster:
*Main fastest_f 12380192300
67652175206
*Main fastest_f 12793129379123
120695231674999
I just thought I'd point out that running with these particular values
on a machine with a 32 bit Int will cause your
Hi Simon,
I'm interested in this as well (you might have seen my other posts
about getting QuickFIX interfaced with Haskell).
One question (Yitzchak raises a valid point):
Why port QuantLib's structure rather than directly build an idiomatic
Haskell quantitative finance library? Especially
On Fri, 9 Jul 2010 17:14:31 +0200, you wrote:
One of the nice things about English is that there is often never an
always. See http://grammar.quickanddirtytips.com/ie-eg-oh-my.aspx for a
discussion.
Well, that page pretty much confirms what I said. In AMERICAN English,
they're always followed by
I think you are right there - the tech report I linked to does credit
the interface to Niklas Röjemo, so I shouldn't have used the word
originator (as you suggested popularised would have been better).
Unfortunately the thesis doesn't seem available on the web so I can't
see how much of the
That actually doesn't work as long as memo is an array, since then it
has fixed size; you have to also make memo an infinitely large data
(but lazy) structure so that it can hold results for arbitrary n. One
option for doing this of course is to make memo be an infinite list, but
a more
On 15:32 Fri 09 Jul , Sam Martin wrote:
There are plenty of other examples of bit twiddling floats. Floats have
a well defined bit representation (if a slightly complex one) so it's
perfectly reasonable to be able to manipulate it.
Note that the Haskell report does not require IEEE 754
Very true. I was executing the large Int-based examples on a 64 bit machine.
You can of course flip over to Integer on either 32 or 64 bit machines and
alleviate the problem with undetected overflow. Of course that doesn't help
with negative initial inputs
;)
I do agree It is still probably a
On Thu, Jul 8, 2010 at 12:37 PM, Yitzchak Gale g...@sefer.org wrote:
Hi Edward,
Edward Kmett wrote:
It looks like there is a fairly strong effort to fix most of the most
egregious warts in the mtl.
btw, does this overhaul include adding Applicative instances,
perchance?
They are
On Fri, Jul 9, 2010 at 18:35, Steve Schafer wrote:
On Fri, 9 Jul 2010 17:14:31 +0200, Sean Leather wrote:
One of the nice things about English is that there is often never an
always. See http://grammar.quickanddirtytips.com/ie-eg-oh-my.aspx for a
discussion.
Well, that page pretty much
I've just started a Cleveland Haskellers meetup, and for some reason I
haven't thought to ask on this list yet.
If there's anybody from the Greater Cleveland, OH area who is interested,
please sign up! I hope to keep it small and informal. I've had good luck
keeping it small so far.
There's a
I don't know what the rule is, but I personally just replace i.e.
with that is and e.g. with for example in my head, and then apply
whatever punctuation makes sense with those substitutions.
Cheers,
Greg
On 7/9/10 12:17 PM, Sean Leather wrote:
On Fri, Jul 9, 2010 at 18:35, Steve Schafer
Hi,
8. [...] Saying 0**0 is undefined seems reasonable,
but why 0**y?
I agree on 0**y being 0 (not undefined), but why should 0**0 be undefined? x**0
:= 1, by convention. Of course this is a still ongoing debate (regarding
analysis of functions etc.), but the most usefull approach for /any/
On Fri, Jul 09, 2010 at 03:13:19PM -0400, Edward Kmett wrote:
On Thu, Jul 8, 2010 at 12:37 PM, Yitzchak Gale g...@sefer.org wrote:
btw, does this overhaul include adding Applicative instances,
perchance?
They are already part of monads-fd and would, I presume, come along for the
On Sat, Jul 10, 2010 at 12:12:15AM +0200, Julian Fleischer wrote:
8. [...] Saying 0**0 is undefined seems reasonable,
but why 0**y?
I agree on 0**y being 0 (not undefined), but why should 0**0 be undefined?
x**0 := 1, by convention. Of course this is a still ongoing debate (regarding
On Fri, Jul 09, 2010 at 06:07:04PM -0500, Alex Stangl wrote:
I wasn't arguing that 0**0 *ought* to be undefined, but that it
is a reasonable policy, since, as you point out, it's a matter
of ongoing debate. What I don't understand is why for y /= 0,
0**y would be undefined. Maybe the
Brandon S Allbery KF8NH allb...@ece.cmu.edu writes:
On 7/8/10 22:25 , Alex Stangl wrote:
1. I.E. and e.g. should be followed by commas -- unless UK usage
differs from US standards. (Page 3 and elsewhere, although FFI chapter
I don't think I've ever seen them *followed* by commas. Preceded,
Kevin Quick qu...@sparq.org writes:
I would think that only mutually recursive default methods would
require respecification and that there could be any number of default
methods that were reasonable as is. Since it's probably quite
difficult for the Haskell compiler to analytically detect
On 10 July 2010 01:22, Ivan Lazar Miljenovic ivan.miljeno...@gmail.com wrote:
Brandon S Allbery KF8NH allb...@ece.cmu.edu writes:
On 7/8/10 22:25 , Alex Stangl wrote:
1. I.E. and e.g. should be followed by commas -- unless UK usage
differs from US standards. (Page 3 and elsewhere,
On Fri, 09 Jul 2010 16:26:13 -0700, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
Kevin Quick qu...@sparq.org writes:
I would think that only mutually recursive default methods would
require respecification and that there could be any number of default
methods that were reasonable
On Fri, Jul 9, 2010 at 8:46 PM, Kevin Quick qu...@sparq.org wrote:
On Fri, 09 Jul 2010 16:26:13 -0700, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
Kevin Quick qu...@sparq.org writes:
I would think that only mutually recursive default methods would
require respecification and
On Jul 9, 2010, at 5:46 PM, Kevin Quick wrote:
That's probably an interesting assertion that one of the category
theorists around here could prove or disprove. ;-)
It's not too hard. I don't like thinking about it in terms of
category theory, though. It's easier to think about it in
Brandon S Allbery KF8NH wrote:
On 7/6/10 15:37 , Oscar Finnsson wrote:
but can they also be on a form similar to
a b c d e f g h| b c - d e f | b d g - h
(i.e. d,e,f are decided by the b,c-combination while h is decided by
the b,d,g-combination)?
I think the answer to this is yes, but if
Julian Fleischer wrote:
Hi,
8. [...] Saying 0**0 is undefined seems reasonable,
but why 0**y?
I agree on 0**y being 0 (not undefined), but why should 0**0 be undefined? x**0
:= 1, by convention.
I'm not familiar with that convention. So far as I'm aware, the x**0=1
vs 0**y=0 conflict
Christopher Done wrote:
On 10 July 2010 01:22, Ivan Lazar Miljenovic ivan.miljeno...@gmail.com wrote:
Brandon S Allbery KF8NH allb...@ece.cmu.edu writes:
On 7/8/10 22:25 , Alex Stangl wrote:
1. I.E. and e.g. should be followed by commas -- unless UK usage
differs from US standards. (Page 3
Hi all,
I want to use *plugins* package
(http://hackage.haskell.org/package/plugins-1.4.1)
Unfortunately, it looks broken.
Anybody can fix it?
Thanks,
-- Andy
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Andy Stewart lazycat.mana...@gmail.com writes:
Hi all,
I want to use *plugins* package
(http://hackage.haskell.org/package/plugins-1.4.1)
Unfortunately, it looks broken.
Anybody can fix it?
Try putting an upper bound in the constraint for `base'; since there's
no upper bound,
On Fri, 09 Jul 2010 18:57:34 -0700, Edward Kmett ekm...@gmail.com wrote:
I hope the above demonstrate that there are at least some fairly reasonable
(and, given your request, appropriately category theoretic!) examples where
one would want the ability to specify that there is more than one
Hi Ivan,
Ivan Lazar Miljenovic ivan.miljeno...@gmail.com writes:
Andy Stewart lazycat.mana...@gmail.com writes:
Hi all,
I want to use *plugins* package
(http://hackage.haskell.org/package/plugins-1.4.1)
Unfortunately, it looks broken.
Anybody can fix it?
Try putting an upper bound in
Andy Stewart lazycat.mana...@gmail.com writes:
Hi Ivan,
Ivan Lazar Miljenovic ivan.miljeno...@gmail.com writes:
Andy Stewart lazycat.mana...@gmail.com writes:
Hi all,
I want to use *plugins* package
(http://hackage.haskell.org/package/plugins-1.4.1)
Unfortunately, it looks broken.
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