dot(**)

X ** Y

X and Y is a scalar/vector/matrix. If both of X and Y are vectors, they must have the same length. If one of X/Y is a matrix and the other is a vector/matrix, their dimensions must satisfy the rules of matrix multiplication.

Return the matrix multiplication of X and Y. If X and Y are vectors of the same length, return their inner product.

x=1..6$2:3;
y=1 2 3;
x dot y;

x=1..6$2:3;
y=6..1$3:2;
x**y;

y**x;

z=1 2 3;
shape z;
// output
3:1
x**z;
// matrix and vector multiplication

x=1 2 3;
y=4 5 6;
x ** y;
// output
32
// inner product of two vectors. Equivalent to 1*4 + 2*5 + 3*6

x ** 2;
// output
[2,4,6]

x=1..6$2:3
x ** 2;
Use * rather than ** for scalar and matrix multiplication.