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ISIS - Image Subtraction Method

  1. Sep 26, 2011 #1
    I'm not sure if anyone here has used ISIS image subtraction program written by Alard, available online at http://www2.iap.fr/users/alard/package.html, but I'm hoping someone has.

    I'm currently working on a bit of research that requires PSF matching to work, and this program should easily take care of that. However, I can't find any documentation other than his tutorial on how to use it.

    That would be fine, as I have it installed, but it fails during the second step of the tutorial (the ref.csh) on my data.

    Specifically, I get "Run error....Singular matrix in routine LUDCMP
    Goodbye ! "

    Here's hoping someone is able to help, it's driving me a bit insane. Thanks in advance!
  2. jcsd
  3. May 28, 2016 #2
    I had this same problem.
    It seemed to be fixed when I made sure that, in default_config, pix_min had a lower value than min_stamp_center.
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