HP NW280AAABA Manual do Utilizador descarregar pdf (Página 482)

100

101

476 Matrices

RREF Reduced Row-Echelon Form. Changes a rectangular

matrix to its reduced row-echelon form.

RREF(matrix)

Example:

RREF returns

Create

Make Creates a matrix of dimension rows × columns, using

expression to calculate each element. If expression

contains the variables I and J, then the calculation for each

element substitutes the current row number for I and the

current column number for J. You can also create a vector

by the number of elements (e) instead of the number of

rows and columns.

MAKEMAT(expression, rows, columns)

MAKEMAT

(expression, elements)

Examples:

MAKEMAT(0,3,3) returns a 3 × 3 zero matrix,

[[0,0,0],[0,0,0],[0,0,0]].

MAKEMAT(√2,2,3) returns the 2 × 3 matrix

[[√2,√2,√2],[√2,√2,√2]].

MAKEMAT(I+J–1,2,3) returns the 2 × 3 matrix

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

Note in the example above that each element is the

sum of the row number and column number minus 1.

MAKEMAT(√2,2) returns the 2-element vector

[√2,√2].

Identity Identity matrix. Creates a square matrix of dimension

size × size whose diagonal elements are 1 and off-

diagonal elements are zero.

IDENMAT(size)

12– 1

34 1–

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1 0 0.2

0 1 0.4–

1 2 ... 477 478 479 480 481 482 483 484 485 486 487 ... 615 616

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