Henning Thielemann wrote:
On Wed, 13 Jun 2007, L.Guo wrote:
I already have one matrix of type [[a]] to store one image.
What I want to do is to devide the image into severial small blocks in same
size.
To do that, I wrote this tool function.
chop :: Int -> [a] -> [[a]]
chop _ [] = []
chop n ls = take n ls : chop n (drop n ls)
I assume that it is more efficient to use 'splitAt' instead of 'take' and
'drop'.
But I do not know how to use it to write the function.
chop blockHeight (map (chop blockWidth) image)
That would divide
abcd
efgh
ijkl
mnop
into
[
[
ab
cd
,
ef
gh
]
,
[
ij
kl
,
mn
op
]
]
at block size 2. In any case, the original poster was not very clear
about what they want...
--
Dr. Janis Voigtlaender
http://wwwtcs.inf.tu-dresden.de/~voigt/
mailto:[EMAIL PROTECTED]
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