avectors: Computes the angle between two vectors
In nitlon/Eartheaters: Stereo Camera Calibration and Reconstruction

Description Usage Arguments Value Author(s) Examples

This function returns the angle (in radians) between two vectors. The vectors can be of any dimension.

1	avectors(u, v)

`u`	a vector
`v`	a vector

the angle (in radians) between the two input vectors.

Aaron Olsen

## THE ANGLE BETWEEN TWO 2D, ORTHOGONAL VECTORS
## VALUE IS EQUAL TO asin(1/sqrt(2))
u <- c(0, 1)
v <- c(1, 0)
avectors(u, v)

## THE ANGLE BETWEEN TWO 3D VECTORS
## VALUE IS EQUAL TO asin(sqrt(2)/sqrt(3))
u <- c(1, 1, 1)
v <- c(0, 1, 0)
avectors(u, v)