gaussCol M
This function does certain column reductions in a matrix M, if M is of a certain type as in this example.
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What it does is that it starts from the bottom right and if it finds a -1 then it uses that column to reduces all other columns to a form with a zero in the corresponding row. It then continues up left searching for the next -1 and repeats the procedure.
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The object gaussCol is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/FiniteFittingIdeals.m2:318:0.