rray_multiply_add: Fused multiply-add
In DavisVaughan/rray: Simple Arrays

Description Usage Arguments Value Examples

rray_multiply_add() computes x * y + z, with broadcasting. It is more efficient than simply doing those operations in sequence.

1	rray_multiply_add(x, y, z)

x, y, z

A vector, matrix, array or rray.

An object of the common type of the inputs, containing the result of the multiply-add operation.

rray_multiply_add(2, 3, 5)

# Using broadcasting
rray_multiply_add(matrix(1:5), matrix(1:2, nrow = 1L), 3L)

# ^ Equivalent to:
x <- matrix(rep(1:5, 2), ncol = 2)
y <- matrix(rep(1:2, 5), byrow = TRUE, ncol = 2)
z <- matrix(3L, nrow = 5, ncol = 2)
x * y + z