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Re: operator fails? [message #72599 is a reply to message #72598]

Thu, 23 September 2010 06:41

Gray
Messages: 253
Registered: February 2010

Senior Member

On Sep 23, 9:28 am, Paulo Penteado <pp.pente...@gmail.com> wrote:
> On Sep 23, 10:20 am, Gray <grayliketheco...@gmail.com> wrote:
>
>
>
>
>
>> 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.
>
> Did you not want it to be
>
> yb = 0 > (rebin(transpose(srcy),2,nsrc,/sample)+bs) < (s[1]-1)
>
> ?

Thank you. Sigh...

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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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