Excerpts from Bryan O'Sullivan's message of Wed Oct 07 23:25:10 +0200 2009:
On Wed, Oct 7, 2009 at 1:59 PM, Michael Mossey m...@alumni.caltech.eduwrote:
My thread about randomness got hijacked so I need to restate my remaining
question here. Is it acceptable to write pure routines that use
My thread about randomness got hijacked so I need to restate my remaining
question here. Is it acceptable to write pure routines that use but do not
return generators, and then call several of them from an IO monad with a
generator obtained by several calls to newStdGen?
shuffle :: RandomGen
On Wed, Oct 7, 2009 at 2:59 PM, Michael Mossey m...@alumni.caltech.edu wrote:
My thread about randomness got hijacked so I need to restate my remaining
question here. Is it acceptable to write pure routines that use but do not
return generators, and then call several of them from an IO monad
On Wed, Oct 7, 2009 at 1:59 PM, Michael Mossey m...@alumni.caltech.eduwrote:
My thread about randomness got hijacked so I need to restate my remaining
question here. Is it acceptable to write pure routines that use but do not
return generators, and then call several of them from an IO monad
Luke Palmer wrote:
On Wed, Oct 7, 2009 at 2:59 PM, Michael Mossey m...@alumni.caltech.edu wrote:
My thread about randomness got hijacked so I need to restate my remaining
question here. Is it acceptable to write pure routines that use but do not
return generators, and then call several of
Am Mittwoch 07 Oktober 2009 23:28:59 schrieb Michael Mossey:
Luke Palmer wrote:
On Wed, Oct 7, 2009 at 2:59 PM, Michael Mossey m...@alumni.caltech.edu
wrote:
My thread about randomness got hijacked so I need to restate my
remaining question here. Is it acceptable to write pure routines
On Wed, Oct 7, 2009 at 2:28 PM, Michael Mossey m...@alumni.caltech.eduwrote:
I don't quite follow your response. I want a program that initializes the
generator from the global generator because I want different behavior every
time I run it. So it will need IO. That's what I was trying to
And the one liner:
(rand 1 10) = return . (\v - take v [1..10])
What about:
take $ rand 1 10 * pure [1..10]
(more readable IMHO).
One could even define:
f % x = f * pure x
and have
take $ rand 1 10 % [1..10]
Also, why not using getRandomR(1,10) instead?
take $ getRandomR
Iain Barnett wrote:
On 24 Sep 2008, at 10:13 pm, Evan Laforge wrote:
For one approach, check
out 'replicate' to make copies of something, and then 'sequence' to
run them and return a list.
Thanks, I haven't found anything that explains 'sequence' well yet, but
I'll keep looking.
Yet
Hi,
I have a function, that produces a random number between two given
numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR (low,high))
(Naively) I'd like to write something like
take (rand 1 10 ) [1..10]
and see [1,2,3,4] ... or anything but nasty type-error
Iain Barnett wrote:
Hi,
I have a function, that produces a random number between two given numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR (low,high))
(Naively) I'd like to write something like
take (rand 1 10 ) [1..10]
and see [1,2,3,4] ... or anything but nasty
forgot return, of course:
myTake :: IO [Int]
myTake = do
n - rand 1 10
return $ take n [1..10]
Lev Walkin wrote:
Iain Barnett wrote:
Hi,
I have a function, that produces a random number between two given
numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR
On Wed, Sep 24, 2008 at 2:03 PM, Iain Barnett [EMAIL PROTECTED] wrote:
Hi,
I have a function, that produces a random number between two given numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR (low,high))
(Naively) I'd like to write something like
take (rand 1 10 )
And the one liner:
(rand 1 10) = return . (\v - take v [1..10])
On Wed, Sep 24, 2008 at 5:10 PM, Lev Walkin [EMAIL PROTECTED] wrote:
forgot return, of course:
myTake :: IO [Int]
myTake = do
n - rand 1 10
return $ take n [1..10]
Lev Walkin wrote:
Iain Barnett wrote:
Hi,
Your forgetfulness boosted my ego for a few seconds - I wasn't the
only one! :)
Thanks very much, that's a big help.
Iain
On 24 Sep 2008, at 10:10 pm, Lev Walkin wrote:
forgot return, of course:
myTake :: IO [Int]
myTake = do
n - rand 1 10
return $ take n [1..10]
Lev Walkin
On Wed, 24 Sep 2008, Iain Barnett wrote:
Hi,
I have a function, that produces a random number between two given numbers
rand :: Int - Int - IO Int
rand low high = getStdRandom (randomR (low,high))
If you only need arbitrary numbers, not really random ones, you should
stay away from IO:
On 24 Sep 2008, at 10:13 pm, Evan Laforge wrote:
For one approach, check
out 'replicate' to make copies of something, and then 'sequence' to
run them and return a list.
Thanks, I haven't found anything that explains 'sequence' well yet,
but I'll keep looking.
On 24 Sep 2008, at 10:13 pm,
On Wed, 24 Sep 2008, Iain Barnett wrote:
On 24 Sep 2008, at 10:13 pm, Evan Laforge wrote:
For one approach, check
out 'replicate' to make copies of something, and then 'sequence' to
run them and return a list.
Thanks, I haven't found anything that explains 'sequence' well yet, but I'll
On Wed, 2008-09-24 at 22:44 +0100, Iain Barnett wrote:
On 24 Sep 2008, at 10:13 pm, Evan Laforge wrote:
For one approach, check
out 'replicate' to make copies of something, and then 'sequence' to
run them and return a list.
Thanks, I haven't found anything that explains 'sequence' well
On 2008 Sep 24, at 17:44, Iain Barnett wrote:
On 24 Sep 2008, at 10:13 pm, Evan Laforge wrote:
For one approach, check
out 'replicate' to make copies of something, and then 'sequence' to
run them and return a list.
Thanks, I haven't found anything that explains 'sequence' well yet,
but
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