m = matrix{{1,2,3},{4,5,6}}
n = mutableMatrix m
m2 = matrix n
m2 - m == 0
n_(0,0) = 212314323
n_(0,0)
n
numrows n
numColumns n
numcols n
ring n
mutableIdentity(RR_100,5)
mutableMatrix(QQ,3,5)
randomMutableMatrix(4,4,.5,100)