If both A and B are matrices, then A \
B is the (numerical) solution of matrix equation
A X = B. The matrix A must be an
non-singular square matrix and B must have
n rows.
For example
>> A = [1, 2, -3; 2, 1, 5; 0, -1, 5];
>> b = [3; 1; -2];
>> x = A \ b
0.75
0.75
-0.25
>> A * x
3
1
-2
>> norm(A*x-b)
2.220446049e-16
Note that is only approximately equal to .
oz
2009-12-22