Hp 38g Graphing Calculator Manual do Utilizador descarregar pdf (Página 143)

Examples

Filling You can create and fill a matrix with zeros for the diagonal

Matrices elements and ones for the off-diagonal elements using the

MAKEMAT (make matrix) function. For example, entering

MAKEMAT (IA J, 4,4) creates a 4 X 4 matrix with ones for all

elements except zeros on the diagonal. The logical operator

A returns 0 when I (the row number) and J (the column

number) are equal, and returns 1 when they are not equal.

Identity Matrix You can create an identity matrix with the IDENMAT

function. For example, ideimat (2) creates the 2 x2 identity

matrix [[1,0],[0,1]].

Redimension a Suppose the variable MO is a 2x2 matrix containing

Matrix [[3,4],[5,6]]. The programming command

REDIM MO; {2,1} would redimension it to a matrix of

2rowsxl column, [ [3], [4]]. The command REDiM MO; {4}

would redimension it to the column vector [3,4,5,6]. To see

the redimensioned matrix, either recall the matrix to the edit

line (|A...z|M 0 I ENTER I), or use the Matrix editor

(■ [MATRIX]).

Transposing a The TRN function swaps the row-column and column-row

Matrix elements of a matrix. For instance, element 1,2 (row 1,

column 2) is swapped with element 2,1, element 2,3 is

swapped with element 3,2, and so on.

For example, TRN ([[1,2], [3,4]]) creates the matrix

[[1,3], [2,4]].

Using Matrices 6-13

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 227 228

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Hp 38g Graphing Calculator Manual do Utilizador Página 143