lokheart - 2 years ago 113

R Question

What is this? I can't find help by using

`?`

`> 1%*%1`

[,1]

[1,] 1

> 10%*%10

[,1]

[1,] 100

> c(1:2)%*%c(1:2)

[,1]

[1,] 5

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Answer Source

It's a matrix multiplication operator!

From the documentation:

Description:Multiplies two matrices, if they are conformable. If one argument is a vector, it will be promoted to either a row or column matrix to make the two arguments conformable. If both are vectors of the same length, it will return the inner product (as a matrix).

Usage:`x %*% y`

Arguments:

`x`

,`y`

numeric or complex matrices or vectors

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