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Re: operator fails? [message #72614 is a reply to message #72608]

Wed, 22 September 2010 13:59

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Gray writes:

> Can anyone explain this?
>
> IDL> nsrc = n_elements(srcy)
> IDL> s = size(img,/dim)
> IDL> bs = rebin([-10,10],2,nsrc,/sample)
> IDL> yb = 0. > rebin(transpose(srcy),2,nsrc,/sample)+bs < s[1]-1
> IDL> print, n_elements(where(yb lt 0))
> 5
>
> How does yb ever become less than 0? Isn't the > operator in this
> usage supposed to prevent this?? Thanks.

This is one of the classic gotchas. You are going
to need some parentheses in that long line. Do you
see it? :-)

Cheers,

David

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

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[Message index]

		Re: operator fails? By: David Fanning on Thu, 23 September 2010 06:51
		Re: operator fails? By: Gray on Thu, 23 September 2010 06:41
		Re: operator fails? By: penteado on Thu, 23 September 2010 06:28
		Re: operator fails? By: Gray on Thu, 23 September 2010 06:20
		Re: operator fails? By: Gray on Wed, 22 September 2010 17:13
		Re: operator fails? By: David Fanning on Wed, 22 September 2010 13:59

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