In article <[EMAIL PROTECTED]>,
"S. Alexander Jacobson" <[EMAIL PROTECTED]> wrote:
> I assume there is a standard name for this
> class/function:
>
>instance Foo [] where
> foo [] = mzero
> foo (x:_) = return x
>
>instance Foo (Maybe x) where
> foo Nothing = mzero
>
I assume there is a standard name for this
class/function:
instance Foo [] where
foo [] = mzero
foo (x:_) = return x
instance Foo (Maybe x) where
foo Nothing = mzero
foo Just x = return x
-Alex-
__
S. Alexander Jaco
Hi,
I've just installed ghc-6.2.2, but couldn't get the docs made.
I got the following:
Text/Regex.raw-hs Text/Regex/Posix.raw-hs Text/Show.raw-hs
Text/Show/Functions.raw-hs \
--package=base \
--dump-interface=base.haddock \
--use-index=../doc-index.html --use-contents=../i
On Fri, Jan 21, 2005 at 02:53:04PM +, John Goerzen wrote:
> I've been playing with HaXmL lately. I've had a need to convert one XML
> document to another, and HaXmL was very nice for that.
>
> Along the way, I've discovered that I need to do some I/O as part of the
> conversion (specifically
On 2005-01-21, Peter Simons <[EMAIL PROTECTED]> wrote:
> > 24 * ((fromIntegral $ tdDay td) +
> > 30 * ((fromIntegral $ tdMonth td) +
> > 365 * (fromIntegral $ tdYear td)
>
> I was wondering: Does this calculation account for leap
Hello,
I have built a fixed Hugs for the Zaurus PDA running the OpenZaurus
distribution. Download here:
http://quux.org/devel/zaurus/hugs_hugs98-Nov2003-r1_arm.ipk
Every module except Posix signals appears to be working.
-- John
___
Haskell-Cafe ma
John Goerzen <[EMAIL PROTECTED]> writes:
> type CFilter = Content -> [Content]
>
> Try as I might, I could not figure out a nice way to integrate I/O into
> this system. A simple IO CFilter wouldn't work, since there has to be
> input available when it runs. Content -> IO [Content] didn't work
Peter Simons <[EMAIL PROTECTED]> writes:
> I was wondering: Does this calculation account for leap
> years? Does it have to?
C itself leaves unspecified the question whether its time calculations
take leap seconds into account. All other systems I know of ignore
leap seconds: POSIX C, Common Lisp
John Goerzen writes:
> timeDiffToSecs :: TimeDiff -> Integer
> timeDiffToSecs td =
> (fromIntegral $ tdSec td) +
> 60 * ((fromIntegral $ tdMin td) +
> 60 * ((fromIntegral $ tdHour td) +
> 24 * ((fromIntegral $ tdDay td) +
> 30 * ((from
On Fri, 2005-01-21 at 16:26 +, Keean Schupke wrote:
> Udo Stenzel wrote:
> >Thus the question is, does select() reliably tell if read() would block or
> >does it
> >check for something else? Is the documentation wrong (on some platforms)?
> >
> >
> Having read around I have found that selec
On 21 January 2005 16:27, Keean Schupke wrote:
> Having read around I have found that select does return readable for
> all file IO on a block device...
>
> I wonder if ghc could use non-blocking mode (files opened with the
> O_NONBLOCK) flag?
GHC does use the O_NONBLOCK flag.
Cheers,
S
Udo Stenzel wrote:
The Glibc documentation says, "select determines if there is data available
(more precisely, if a call to read(2) will not block)." I think, this is reasonably
precise. The OS does know, where you are going to read (at the file pointer)
and if you seek() or pread() instead, we
On Fri, Jan 21, 2005 at 02:55:31PM -, Simon Marlow wrote:
> Have you seen this, BTW:
>
> http://www.haskell.org/~simonmar/time/NewTime.html
Ah. I think I found several discussions in reply to that but never did
actually track down that URL.
I'll take a look.
> > timelocal :: CalendarTime
On 21 January 2005 14:31, John Goerzen wrote:
> I checked the following code into MissingH. I would be pleased if you
> could take it for fptools. I should note that I am using an Integer
> rather than an Int to represent seconds, since I think that is proper
> given the size of values we might
I've been playing with HaXmL lately. I've had a need to convert one XML
document to another, and HaXmL was very nice for that.
Along the way, I've discovered that I need to do some I/O as part of the
conversion (specifically due to timezone-related calculations). Much of
HaXML is based around th
On Fri, Jan 21, 2005 at 01:56:23PM -, Simon Marlow wrote:
> I can't tell what's wrong here, if anything (general brokenness in the
> System.Time API notwithstanding). Ah *lightbuilb* - I think I see: you
> want to take a calendar time without any TZ information, assume it is a
> time at the cu
On 20 January 2005 22:12, John Goerzen wrote:
> I have a simple desire. I have a string that I need to parse as a
> date/time string in the local timezone, then convert it to standard
> seconds-since-epoch format. This is trivial in C, Perl, Python, etc.
> but seems impossible to do reliably in
Duncan Coutts <[EMAIL PROTECTED]> writes:
> The point is that the Unix documentation does not consider the short
> pause as data is read off your hard drive to be blocking. So that's why
> select will always report that data is available when you use it with a
> file handle.
Isn't this also for h
On Tue, 18 Jan 2005, Dmitri Pissarenko wrote:
> Hello!
>
> Is there a math library for Haskell, using which one can calculate eigenvalues
> of matrices?
http://haskell.org/libraries/#numerics
Indexless linear algebra algorithms
They contain Eigensystem functions, but I remember that they were
On Fri, Jan 21, 2005 at 12:42:56PM +, Keean Schupke wrote:
> Ben Rudiak-Gould wrote:
> >If you're reading from a random-access file, there's no way it can
> >tell you when the file data is buffered, because it doesn't know which
> >part of the file you plan to read. The OS may try to guess fo
On Fri, 2005-01-21 at 12:33 +, Keean Schupke wrote:
> Glynn Clements wrote:
>
> > The central issue is that the Unix API doesn't distinguish between
> >
> >cases 1 and 2 when it comes to non-blocking I/O, asynchronous I/O,
> >select/poll etc. [OTOH, NT overlapped I/O and certain Unix extension
Ben Rudiak-Gould wrote:
If you're reading from a random-access file, there's no way it can
tell you when the file data is buffered, because it doesn't know which
part of the file you plan to read. The OS may try to guess for
readahead purposes, but select()'s behavior can't depend on that guess.
Glynn Clements wrote:
The central issue is that the Unix API doesn't distinguish between
cases 1 and 2 when it comes to non-blocking I/O, asynchronous I/O,
select/poll etc. [OTOH, NT overlapped I/O and certain Unix extensions
do distinguish these cases, i.e. data is only "available" when it's in
ph
On Fri, 2005-01-21 at 07:25 +, Adrian Hey wrote:
> On Thursday 20 Jan 2005 7:35 pm, Dmitri Pissarenko wrote:
> > In my program, I need ONLY to read an image and to transform it into such
> > matrix.
> >
> > Which graphics library can you recommend, if no other image manipulation
> > operations
Ben Rudiak-Gould <[EMAIL PROTECTED]> schrieb am 21.01.05 02:37:34:
> If you're reading from a random-access file, there's no way [select] can tell
> you when the file data is buffered, because it doesn't know which part
> of the file you plan to read. The OS may try to guess for readahead
> pur
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