I am trying to implement the GAP algorithm given in https://arxiv.org/pdf/1708.06538.pdf to compute the group cohomology of finite groups. One of the functions they use is "ComplementIntMatWithTransforms" (page 12 of the linked paper). When I tried to use this function on GAP I got the following error.
RuntimeError: Gap produced error output Error, Variable: 'ComplementIntMatWithTransforms' must have a value
I am unable to find this function in the GAP documentation. I did find the function "ComplementIntMat" (this is 25.1-6 at https://docs.gap-system.org/doc/ref/chap25.html). I don't get any errors with this function. However, without a documentation for "ComplementIntMatWithTransforms" I am not sure whether these two functions are the same. If someone could clarify this that would be great!
I am using GAP within SageMath 9.6.
ComplementIntMatWithTransformsis not a standard GAP function, nor does it seem in any of the packages distributed with the system. I suppose it is a private function, written by the authors of the article, possibly simply keepingtrack of the base change inComplementIntMat. Your best option is likely to contact said authors and ask them.