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一个向量的长度（大小）

Synopsis

VLENF(A)

Description

Returns the length (magnitude) of a vector.

Using the function as shown below, where A is an array consisting of the three components of a vector,

D=VLENF(A)

is equivalent to the following expression:

D=SQRTF(A(1)*A(1)+A(2)*A(2)+A(3)*A(3))

Parameters

Parameter	Description
A	A three-position numerical array which represents the components of a vector.