HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 331)

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The product of a vector with a matrix is possible if the vector is a row vector,

i.e., a 1×m matrix, which multiplied with a matrix m×n produces a 1xn matrix

(another row vector). For the calculator to identify a row vector, you must use

double brackets to enter it, e.g.,

Term-by-term multiplication

Term-by-term multiplication of two matrices of the same dimensions is possible

through the use of function HADAMARD. The result is, of course, another

matrix of the same dimensions. This function is available through Function

catalog (‚N), or through the MATRICES/OPERATIONS sub-menu

(„Ø). Applications of function HADAMARD are presented next:

The identity matrix

In Chapter 9 we introduce the identity matrix as the matrix I = [δ

]

, where δ

is the Kronecker’s delta function. Identity matrices can be obtained by using

function IDN described in Chapter 9. The identity matrix has the property that

A⋅I = I⋅A = A. To verify this property we present the following examples

using the matrices stored earlier on:

1 2 ... 326 327 328 329 330 331 332 333 334 335 336 ... 863 864

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HP 48gII Graphing Calculator Manual do Utilizador Página 331

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