HP 39g+ Graphing manual Matrices 13-7

To multiply and divide by a scalar

To multiply two matrices

To divide by a square matrix

3.Add the matrices that you created.

M1

M2

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 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.

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.

Matrices 13-7