HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 286)

100

101

Page 9-11

Magnitude

The magnitude of a vector, as discussed earlier, can be found with function

ABS. This function is also available from the keyboard („Ê). Examples

of application of function ABS were shown above.

Dot product

Function DOT is used to calculate the dot product of two vectors of the same

length. Some examples of application of function DOT, using the vectors A,

u2, u3, v2, and v3, stored earlier, are shown next in ALG mode. Attempts to

calculate the dot product of two vectors of different length produce an error

message:

Cross product

Function CROSS is used to calculate the cross product of two 2-D vectors, of

two 3-D vectors, or of one 2-D and one 3-D vector. For the purpose of

calculating a cross product, a 2-D vector of the form [A

, A

], is treated as the

3-D vector [A

, A

,0]. Examples in ALG mode are shown next for two 2-D and

two 3-D vectors. Notice that the cross product of two 2-D vectors will produce

a vector in the z-direction only, i.e., a vector of the form [0, 0, C

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HP 48gII Graphing Calculator Manual do Utilizador Página 286

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