matrix(MutableMatrix) -- make a matrix from a mutable one

Synopsis

Function: matrix
Usage:

matrix m
Inputs:
- m, a mutable matrix
Optional inputs:
- Degree => ..., default value null, create a matrix from a doubly-nested list of ring elements or matrices
Outputs:
- a matrix, the same matrix as m, but not mutable.

There are many more operations available for matrices than for immutable matrices, but mutable matrices are sometimes easier to construct.

i1 : m = mutableMatrix(ZZ,3,5)

o1 = 0

o1 : MutableMatrix

i2 : m_(1,2) = 3

o2 = 3

i3 : m_(2,4) = 54

o3 = 54

i4 : m_(0,0) = -12

o4 = -12

i5 : m

o5 = | -12 0 0 0 0  |
     | 0   0 3 0 0  |
     | 0   0 0 0 54 |

o5 : MutableMatrix

i6 : matrix m

o6 = | -12 0 0 0 0  |
     | 0   0 3 0 0  |
     | 0   0 0 0 54 |

              3        5
o6 : Matrix ZZ  <--- ZZ