HP 40gs Manual do Utilizador descarregar pdf (Página 322)

100

101

18-8 Matrices

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.

To divide the two matrices M1 and M2 that you created

for the previous example, press the following keys:

To invert a matrix You can invert a square matrix in HOME by typing the

matrix (or its variable name) and pressing x

–1

. Or you can use the matrix INVERSE command.

Enter INVERSE(matrixname) in HOME and press

To negate each

element

You can change the sign of each element in a matrix by

pressing before the matrix name.

Solving systems of linear equations

Example Solve the following linear system:

1. Open the Matrix

catalog and create a

vector.

MATRIX

2. Create the vector of the

constants in the linear

system.

5 7

2x 3y 4z++ 5

xyz–+7

4xy–2z+1

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