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Re: HELP with IF statement [message #91271 is a reply to message #91268]

Thu, 25 June 2015 05:22

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

g.nacarts@gmail.com writes:

> I have a problem with IF statement
>
> I wanted to check whether my array A has any zero element and if so then simply return a zero array (with two zeroes). I typed the following but am not sure if it's correct.
>
> A FLOAT = Array[58]
>
> FOR i=0L, 57 DO BEGIN
> IF A[i] EQ 0 THEN RETURN, [0,0]
> ENDFOR

There are a whole host of articles on my web page explaining why it will
be impossible to find a zero value in an array of floats. I'll just give
you the bottom line: use Floats_Equal from the Coyote Library to do this
kind of comparison:

IF Floats_Equal(a[i],0) THEN RETURN, [0,0]

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		HELP with IF statement By: g.nacarts on Thu, 25 June 2015 04:10
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 05:22
		Re: HELP with IF statement By: g.nacarts on Thu, 25 June 2015 05:48
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 05:51
		Re: HELP with IF statement By: g.nacarts on Thu, 25 June 2015 05:56
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 05:59
		Re: HELP with IF statement By: Paul Van Delst[1] on Thu, 25 June 2015 08:20
		Re: HELP with IF statement By: g.nacarts on Thu, 25 June 2015 08:34
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 08:42
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 08:46
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 08:53
		Re: HELP with IF statement By: David Fanning on Thu, 25 June 2015 08:34
		Re: HELP with IF statement By: Paul Van Delst[1] on Thu, 25 June 2015 09:41

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