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How to increase the speed [message #85789]

Mon, 09 September 2013 03:11

sivan
Messages: 13
Registered: August 2012

Junior Member

Hello everyone,

I'll directly tell you the problem.
I have three arrays, one of them contains hundreds of elements, the others have the same number of elements and contain much more.

Let say (a is the first, b is the 2nd, and c is the 3rd array)
a=findgen(250)+1
b=randomn(seed, 2e5)
c=randomn(seed, 2e5)

What I want to do is to calculate the following equation for each element of a and every element of b and c without using the for loop.

exp(a(i) - b)*exp(c)

The result should be a two dimensional array (array[250, 2e5]).

Problem is also shown via this picture (http://oi42.tinypic.com/10zcx7p.jpg).

I use the following code but it is very slow.

result=dblarr(250, 2e5)
for i=0, 249 do result(i,*)=exp(a(i) - b)*exp(c)

Thanks in advice,
Sivan.

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[Message index]

		How to increase the speed By: sivan on Mon, 09 September 2013 03:11
		Re: How to increase the speed By: Moritz Fischer on Mon, 09 September 2013 03:44
		Re: How to increase the speed By: sivan on Mon, 09 September 2013 07:06

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