dot

Vector or array dot product.

Syntax

C = dot(A, B)
C = dot(A, B, dim)

Description

Returns the scalar dot product of vectors A and B, or — when A and B are matrices — a row vector of column-wise dot products. With the optional dim, takes dot products along that dimension. A and B must have the same dimensions.

Examples

dot([1 2 3], [4 5 6])       % 32 (1*4 + 2*5 + 3*6)
dot([1 2; 3 4], [5 6; 7 8]) % [26 44]   per-column
dot([1 2; 3 4], [5 6; 7 8], 2) % [17; 53] per-row

See also

• cross — Cross product of two 3-element vectors.
• mtimes — Matrix multiplication (A * B).