HP 39g+ - Manual (Page 185)

Matrices 13-7
3. Add the matrices that
you created.
M1
M2
To multiply and
divide by a scalar For division by a scalar, enter the matrix first, then the
operator, then the scalar. For multiplication, the order of
the operands does not matter.
The matrix and the scalar can be real or complex. For
example, to divide the result of the previous example by
2, press the following keys:
2
To multiply two
matrices To multiply the two matrices M1 and M2 that you created
for the previous example, press the following keys:
M1 M
2
To multiply a matrix by a
vector, enter the matrix
first, then the vector. The
number of elements in the vector must equal the number
of columns in the matrix.
To divide by a
square matrix For division of a matrix or a vector by a square matrix,
the number of rows of the dividend (or the number of
elements, if it is a vector) must equal the number of rows
in the divisor.
This operation is not a mathematical division: it is a left-
multiplication by the inverse of the divisor. M1/M2 is
equivalent to M2
–1 * M1.