DescTools (version 0.99.54)

Dot: Scalar Product

Description

'dot' or 'scalar' product of vectors or pairwise columns of matrices.

Usage

Dot(x, y)

Value

A scalar or vector of length the number of columns of x and

y.

Arguments

x

numeric vector or matrix

y

numeric vector or matrix

Author

Hans W. Borchers <[e-mail]>

Details

Returns the 'dot' or 'scalar' product of vectors or columns of matrices. Two vectors must be of same length, two matrices must be of the same size. If x and y are column or row vectors, their dot product will be computed as if they were simple vectors.

See Also

Cross

Examples

Dot(1:5, 1:5)  #=> 55
# Length of space diagonal in 3-dim- cube:
sqrt(Dot(c(1,1,1), c(1,1,1)))  #=> 1.732051