[gnuastro-devel] [bug #56573] Arithmetic sigclip-median gives nan values with only 2 images

[Raul Infante-Sainz]

URL:
  <https://savannah.gnu.org/bugs/?56573>

                 Summary: Arithmetic sigclip-median gives nan values with only
2 images
                 Project: GNU Astronomy Utilities
            Submitted by: infantesainz
            Submitted on: Tue 02 Jul 2019 08:52:56 PM UTC
                Category: Arithmetic
                Severity: 3 - Normal
              Item Group: Output not reasonable
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

When trying to combine only two images with `sigclip-median' operator the
result is not reasonable. In the output there are some nan values that I think
it is because the sigma clipped median is not well defined (due to the small
number of values).

That operator with such few number of images has no sense, so maybe it could
print a warning but it should give a result with no nans. If the sigma clipped
median/mean is not well defined, then give the median/mean value (with no
sigma clipping).

Sounds reasonable?




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