Hp 48g Graphing Calculator Manual do Utilizador descarregar pdf (Página 175)

100

101

Calculating with Matrix Elements

To add or subtract two matrices:

1. Enter the two matrices onto the stack in the same order as you

would to add or subtract real numbers. They must have the same

dimensions.

2. Press (2 to add or Q to subtract. The single resulting matrix

has elements that are the sum or difference of the corresponding

elements in the original argument matrices.

To multiply or diwide a matrix by a scalar:

1. Enter the matrix onto the stack.

2. Enter the scalar (a real or complex number).

3. Press Q or Q- Each element of the resulting matrix is the product

or quotient of the scalar and the corresponding element in the

original argument matrix.

To change the sign of each element in a matrix:

1. Enter the matrix onto the stack.

2. Press (Sto change the sign of each element, in the matrix.

To find the matrix product (AB) of two matrices:

1. Enter the two matrices onto the stack. Be careful about the entry

order because matrix multiplication is not commutative. Enter

matrix A first and matrix B second. Remember also that the

number of columns in A must equal the number of rows in B.

2. Press Q. The result will be a matrix with the same number of

rows as A and the same number of columns as B.

To multiply a matrix and vector:

1. Enter the matrix onto the stack.

2. Enter the vector. The number of elements in the vector must equal

the number of columns in the matrix.

3. Press Q. The result will be a vector with as many elements as the

number of rows in the original matrix.

Matrices and Linear Algebra 14-11

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