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Re: operator fails? [message #72601 is a reply to message #72600]

Thu, 23 September 2010 06:20

Gray
Messages: 253
Registered: February 2010

Senior Member

On Sep 22, 8:13 pm, Gray <grayliketheco...@gmail.com> wrote:
> 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

IDL> yb = 0 > (rebin(transpose(srcy),2,nsrc,/sample)+bs) < s[1]-1
IDL> print, where(yb[0,*] le 0)
6 7 18 23 29

Even with the parentheses it still doesn't work.

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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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