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Re: Works on Linux, not on MacOS [message #70052 is a reply to message #69981]

Sat, 06 March 2010 08:12

Gray
Messages: 253
Registered: February 2010

Senior Member

On Mar 5, 10:41 am, wlandsman <wlands...@gmail.com> wrote:
> On Mar 4, 10:59 am, Gray <grayliketheco...@gmail.com> wrote:
>
>> Hi all,
>> MAC:
>> IDL> img = readfits('resid_BrGamma_con.fits',/silent)
>> IDL> find, img, x,y,f,s,r,5.d2,0.02,[-1.0,1.0],[0.2,1.0],/silent
>> IDL> print, x[0:9]
>> -NaN -NaN -NaN -NaN -
>> NaN -NaN -NaN -NaN -NaN -NaN
>
>> What is going on??
>
> You are telling find.pro (http://idlastro.gsfc.nasa.gov/ftp/pro/idlphot/find.pro)
> that the approximate FWHM of sources on your image is 0.02
> pixels. This is not a plausible value, and results in the spurious
> centroid positions.
>
> So why does it work on your Linux machine? I suspect you have an
> older version of find.pro that used a more simplistic (but evidently
> more robust) centroid algorithm. --Wayne

Okay... From the writeup of find.pro it seemed that that keyword
should be the FWHM of the filter (as in, the width of the filter in
wavelength). How do I figure out the FWHM of my sources w/o using
find to pick them out?

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[Message index]

		Works on Linux, not on MacOS By: Gray on Thu, 04 March 2010 07:59
		Re: Works on Linux, not on MacOS By: penteado on Sat, 06 March 2010 08:52
		Re: Works on Linux, not on MacOS By: Gray on Sat, 06 March 2010 08:12
		Re: Works on Linux, not on MacOS By: penteado on Fri, 05 March 2010 07:49
		Re: Works on Linux, not on MacOS By: wlandsman on Fri, 05 March 2010 07:41
		Re: Works on Linux, not on MacOS By: Gray on Fri, 05 March 2010 06:14
		Re: Works on Linux, not on MacOS By: penteado on Thu, 04 March 2010 20:04

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