R: Matrix Crossproduct

crossprod {base} | R Documentation

## Matrix Crossproduct

### Description

Given matrices `x` and `y` as arguments, `crossprod` returns their matrix cross-product. This is formally equivalent to, but faster than, the call `t(x) %*% y`.

### Usage

    crossprod(x, y=x)

### Arguments

`x, y` | matrices.

### See Also

`%*%` and outer product `%o%`.

### Examples

    (z <- crossprod(1:4))    # = sum(1 + 2^2 + 3^2 + 4^2)
    drop(z)                  # scalar

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