dot(**)
Syntax
X ** Y
Arguments
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.
Details
Return the matrix multiplication of X and Y. If X and Y are vectors of the same length, return their inner product.
Examples
$ x=1..6$2:3;
$ y=1 2 3;
$ x dot y;
#0 |
---|
22 |
28 |
$ x=1..6$2:3;
$ y=6..1$3:2;
$ x**y;
#0 |
#1 |
---|---|
41 |
14 |
56 |
20 |
$ y**x;
#0 |
#1 |
#2 |
---|---|---|
12 |
30 |
48 |
9 |
23 |
37 |
6 |
16 |
26 |
$ z=1 2 3;
$ shape z;
3:1
$ x**z;
// matrix and vector multiplication
#0 |
---|
22 |
28 |
$ x=1 2 3;
$ y=4 5 6;
$ x ** y;
32
// inner product of two vectors. Equivalent to 1*4 + 2*5 + 3*6
$ x ** 2;
[2,4,6]
$ x=1..6$2:3
$ x ** 2;
Use * rather than ** for scalar and matrix multiplication.