As far as it goes, I got chatGPT3.5 to reproduce the second snippet in the post, i.e. I asked it to complete this function: // CSparse/Source/cs_gaxpy: spa

As far as it goes, I got chatGPT3.5 to reproduce the second snippet in the post, i.e. I asked it to complete this function: // CSparse/Source/cs_gaxpy: sparse matrix times dense vector // CSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved. // SPDX-License-Identifier: LGPL-2.1+ #include "cs.h" /* y = A*x+y */ csi cs_gaxpy (const cs *A, const double *x, double *y) { // Fill in here } The code was the same. Though it also explained how it worked to me.