Transform a matrix to row echelon form.
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a square matrix representing the coefficients of a linear
a vector representing the right-hand side of the linear
refmatrix reduces a matrix to row echelon form. This is not a
reduced row echelon form, though that can be easily calculated from
the diagonal. This function works on non-square matrices.
rrefmatrix returns the reduced row echelon matrix.
solvematrix solves a linear system using
the modified matrix