Cross-product Z^T Y with FBM or dense matrices

Source: R/solvers.R

Computes \(Z^T Y\), handling FBM objects from bigstatsr as well as base R matrices.

cross_ZY(Y, Z)

Arguments

Y

Gene expression matrix (genes x samples), dense or FBM.

Z

Latent variable matrix (genes x k).

Value

A numeric matrix giving Z^T Y.

Examples

set.seed(123)

genes <- 40
samples <- 10
k <- 4

Y <- matrix(rnorm(genes * samples), nrow = genes)
Z <- matrix(rnorm(genes * k), nrow = genes)

# Compute Z^T Y
res1 <- cross_ZY(Y, Z)
dim(res1) # k × samples
#> [1]  4 10