vle-vector-iscodirectional


(vle-vector-iscodirectional  vec1  vec2)

This function returns whether the vectors vec1 and vec2 are codirectional or not.

Arguments

vec1  a 2d or 3d vector list

vec2  a 2d or 3d vector list

Return

T or NIL

Example

(setq v1 '(2 0 0) v2'(-2 0 0))
(vle-vector-iscodirectional v1 v2)
NIL

(setq v1 '(2 0 0) v2'(3 0 0))
(vle-vector-iscodirectional v1 v2)
T

Remarks

input vectors must not be unit-length (non-normalised vectors are allowed)


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