IsZeroMatrix
Tests if a matrix is a zero matrix.
Syntax

IsZeroMatrix(A[, ε])

A
is a matrix 
ε
is a positive number

Description
If A
is a matrix, then IsZeroMatrix(A, ε)
returns true
iff A
is a zero matrix, that is, iff all its entries are 0 (compared with epsilon ε
).
For all matrices A
, IsZeroMatrix(A, ε) = IsZero(A, ε)
.