HP NW280AAABA Manuel d'utilisateur télécharger pdf (Page 477)

100

101

Matrices 471

To multiply two

matrices

To multiply the two matrices that you created for the

previous example, press the following keys:

AQ1sA

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 raise a matrix to

a power

You can raise a matrix to any power as long as the power

is an integer. The following example shows the result of

raising matrix M1, created earlier, to the power of 5.

AQ1k5

You can also raise a

matrix to a power without

first storing it as a

variable.

Matrices can also be

raised to negative

powers. In this case, the result is equivalent to 1/

[matrix]^ABS(power). In the following example, M1 is

raised to the power of –2.

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.

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HP NW280AAABA Manuel d'utilisateur Page 477

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