Transform a matrix to row echelon form.

1 2 3 4 5 | ```
refmatrix(m)
rrefmatrix(m)
solvematrix(A, b)
``` |

`m` |
a matrix |

`A` |
a square matrix representing the coefficients of a linear
system in |

`b` |
a vector representing the right-hand side of the linear
system in |

`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 `rrefmatrix`

.

the modified matrix

Other linear: `choleskymatrix`

,
`detmatrix`

, `gdls`

,
`invmatrix`

, `iterativematrix`

,
`lumatrix`

, `rowops`

,
`tridiagmatrix`

, `vecnorm`

1 2 |

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