Fused multiply-add

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

rray_multiply_add(x, y, z)

Arguments

x, y, z	A vector, matrix, array or rray.

Value

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

Examples

rray_multiply_add(2, 3, 5)
#> [1] 11

# Using broadcasting
rray_multiply_add(matrix(1:5), matrix(1:2, nrow = 1L), 3L)
#>      [,1] [,2]
#> [1,]    4    5
#> [2,]    5    7
#> [3,]    6    9
#> [4,]    7   11
#> [5,]    8   13

# ^ 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
#>      [,1] [,2]
#> [1,]    4    5
#> [2,]    5    7
#> [3,]    6    9
#> [4,]    7   11
#> [5,]    8   13