Function: copymatrix (<M>) Returns a copy of the matrix <M>. This is the only way to make a copy aside from copying <M> element by element.
Note that an assignment of one matrix to another, as in
m2: m1, does not copy
m1. An assignment
m2 [i,j]: x or
setelmx (x, i, j, m2 also modifies
m1 [i,j]. Creating a copy with
copymatrix and then using assignment creates a separate, modified copy.
(%o1) true (%i2)