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Re: Assigning NaN to arrays [message #39279 is a reply to message #39278]

Sat, 08 May 2004 05:24

Chris Lee
Messages: 101
Registered: August 2003

Senior Member

In article <49b2657.0405080139.3a293765@posting.google.com>, "Eric
Volquardsen" <elv@irtf.ifa.hawaii.edu> wrote:

> I was assigning NaN to the locations of bad pixels in an image. I then
> replace the bad pixels with the median of the surrounding good pixels.
> Instead of doing so, IDL assigned 2.14748e9. Everything I have seen in
> the IDL documentation seems to indicate that this would work.?.

> x = w MOD size_img
> y = w / size_img
> FOR i = 0, (n_elements(w)-1) DO image[w[i]] = MEDIAN(image[x-2:x+2,
> y-2:y+2])

Hi,

If the code is a direct copy-paste, you need some array indices on the
x and y arrays.

Otherwise, it works for me. You didn't say what your typical values are.
Is 2.14e9 not a possible value? Can you provide a sample 5 x 5 grid ?

..
a=findgen(5,5)
a[2,2]=!values.f_nan
print, median(a)
13.0000
..

Chris.

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[Message index]

		Re: Assigning NaN to arrays By: elv on Sun, 09 May 2004 16:18
		Re: Assigning NaN to arrays By: Chris Lee on Sat, 08 May 2004 05:24

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