Having Trouble with ISIS Image Subtraction Method?

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The ISIS image subtraction program by Alard is being used for research requiring PSF matching, but users are encountering issues with documentation and errors during execution. A specific error message, "Run error...Singular matrix in routine LUDCMP," occurs during the second step of the tutorial. One user resolved a similar problem by adjusting the default_config settings, ensuring that pix_min was lower than min_stamp_center. This adjustment seems crucial for successful operation of the program. Assistance is sought from others who may have experienced and solved this issue.
beavez
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Hi
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!
 
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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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