[SciPy-user] Re: vectorize(function)/arraymap did not return arrays?

[Yichun Wei]

Well, I found list comprehension is actually fast enough.

res = [myconvolve(a[x,y], k[x,y]) for x in range(16) for y in range(16)]

which is much faster than

for x in range(16):
     for y in range(16):
         .....

This thread says that list comprehension could be comparable to map, or 
even better if taking in to consideration the time calling helper 
functions in map:
http://mail.python.org/pipermail/python-list/2005-January/259690.html

I did not try list comprehension earlier because I roughly remember I 
was told that list comprehension is syntaxic suger of for loops...


Travis Oliphant wrote:
> Well, I don't know how difficult it would be to write such a general 
> looping function --- I never tried to do it.   It was not on my radar 
> when I wrote arraymap.
> 
> -Travis

Thanks!
- yichun