HP 48gII Graphing Calculator Uživatelský manuál stáhnout pdf (Strana 328)

Addition and subtraction

Consider a pair of matrices A = [a

. Addition and

subtraction of these two matrices is only possible if they have the same

number of rows and columns. The resulting matrix, C = A ± B = [c

. Some examples in ALG mode are shown below using

the matrices stored above (e.g., @A22@ + @B22@)

In RPN mode, the steps to follow are:

A22 ` B22`+ A22 ` B22`-

A23 ` B23`+ A23 ` B23`-

A32 ` B32`+ A32 ` B32`-

Translating the ALG examples to RPN is straightforward, as illustrated here.

The remaining examples of matrix operations will be performed in ALG mode

Multiplication

There are different multiplication operations that involve matrices. These are

described next.

Multiplication by a scalar

Multiplication of the matrix A = [a

by a scalar k results in the matrix C =

. In particular, the negative of a matrix is defined by

the operation -A =(-1)A = [-a

. Some examples of multiplication of a

matrix by a scalar are shown below.

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HP 48gII Graphing Calculator Uživatelský manuál Strana 328