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Re: operator fails? [message #72608 is a reply to message #72601]

Wed, 22 September 2010 17:13

Gray
Messages: 253
Registered: February 2010

Senior Member

On Sep 22, 4:59 pm, David Fanning <n...@dfanning.com> wrote:
> 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.")

Oh. Oh, oh, oh. Grrrrrr..... >:O

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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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