It is easy to invert a matrix using GEMPACK.
To learn how, download the file GPINV4.ZIP (5K)
Unzip the files in GPINV4.ZIP into a new directory and read INV4.TXT. This explains the procedure for inverting a matrix and guides you through a simple 3x3 example. It is easy to modify this example to invert any matrix.
We are grateful to Terry Maidment for raising this question.
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