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For loops vs. matrix operations [message #37441]

Wed, 17 December 2003 13:36

Jonathan Greenberg
Messages: 91
Registered: November 2002

Member

I know some matrix programs perform better if you do straigh matrix math vs.
a for-next loop -- is idl this way? E.g. is:

array=intarr(10000)
for i=0,(10000-1) do begin
array[i]=array[i]+1
endfor

MUCH slower than:

array=intarr(10000)
array=array+1

?

I'm trying to figure out how much time I should be using rewriting some code
to optimize the algorithm, which is why I'm asking (the code is more complex
than above, obviously, but I did notice I could "matricize" some of the code
in places)...

--j

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For loops vs. matrix operations

By: Jonathan Greenberg on Wed, 17 December 2003 13:36

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