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Re: summation problem [message #24549 is a reply to message #24548]

Thu, 05 April 2001 04:15

Jaco van Gorkom
Messages: 97
Registered: November 2000

Member

Manish wrote:
...
> I have a program which produces an array of values of sunlight flux during
> the day. Unfortunately, it produces crazy numbers before the sunrises and
> after it sets(as expected). I'm summing the values throughout the day to
> get a total integrated day flux, but here's the problem - is there a way of
> telling the TOTAL function to ignore negative numbers and NaN numbers?

Yes, there is a way:
IDL> test = [0,-1,3,4,!values.f_nan]
IDL> print, total(test>0,/nan)
7.00000
% Program caused arithmetic error: Floating illegal operand

The 'illegal operand' error appears to be harmless, caused by comparing test>0:
IDL> print, test>0
0.00000 0.00000 3.00000 4.00000 NaN
% Program caused arithmetic error: Floating illegal operand

> I guess this is a simple problem, but would appreciate any help
It is simple enough, but only once you know the solution.

cheers,
Jaco

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[Message index]

		Re: summation problem By: Paul van Delst on Thu, 05 April 2001 08:00
		Re: summation problem By: Manish on Thu, 05 April 2001 05:32
		Re: summation problem By: Jaco van Gorkom on Thu, 05 April 2001 04:15
		Re: summation problem By: Jaco van Gorkom on Thu, 05 April 2001 09:26

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