dot

dot(X, Y)

or

X**Y

X / Y can be a scalar/vector/matrix. If both of X and Y are vectors, they must have the same length. If one of X and Y is a matrix, the other is a vector/matrix and 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;

a=1 2 3;
shape a;
// output
3:1

x**a;

b=1 2;
shape b;
// output
2:1

b**x;  // for a matrix multiplication between a matrix and a vector, the system may rotate the dimension of the vector for the multiplication to go through.

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;
Error: Use * rather than ** for scalar and matrix multiplication.