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Re: Sum of elements in an array [message #2305]

Thu, 09 June 1994 12:06

velt
Messages: 19
Registered: June 1994

Junior Member

In article ftb@due.uninett.no, ragnar@kvark.fi.uib.no (Ragnar Aas) writes:
> I'm working on a project where I need to sum the result of many IF-statements.
> In order to make this operation faster, I want to vectorize it. The way I
> want it is :
>
> sum=(array_1.element EQ 1)
>
> with sum a scalar, and array_1 an array. (BIG surprise!)
> In other words : If array_1.element equals 1, then add 1 to sum.
> How do I go about to solve this?
>
> Thanx in advance.
>
> Ragnar Aas

Try:

sum=n_elements(where(array_1.element EQ 1))

Or, when the values of element can only be 0 or 1:

sum=total(array_1.element)

Good Luck.

Robert Velthuizen
Dept of Radiology
University of South Florida.

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		Re: Sum of elements in an array By: velt on Thu, 09 June 1994 12:06
		Re: Sum of elements in an array By: steinhh on Thu, 09 June 1994 05:17

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