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quickly totaling sections of an array [message #52558]

Tue, 13 February 2007 07:05

Conor
Messages: 138
Registered: February 2007

Senior Member

Hey Everyone,
I'm essentially trying to add together separate sections of an
array, and I need to do it in a very speedy fashion. Here's the
breakdown in IDL. I would want to take an array like this:

vals = [10, 15, 13, 12, 11, 14]

and imagine I have a mask (which I can easily make) like this:

mask = [ 0, 0, 0, 1, 1, 1 ]

I would then want to add together everything with the same mask value
and put it in a new array. So the result would be:

sums = [38, 37]

I'm generating images, and for each image I generate this will be done
1000 times, and there will be 1000 different mask values each time it
is done. I'll be generating a couple hundred images, so I'll be
running this task a couple hundred thounsand times - i.e. execution
speed is very important. Any suggestions on how to speed things up
would be highly appreciated.
Thanks in advanced,
Conor

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