This function rescales the rows of a matrix according to the specified type.
Usage
rescale_matrix(
mat,
type = c("Expression", "Log2 Expression", "Mean Scaled", "Z-score")
)Arguments
- mat
the matrix to rescale
- type
type of rescaling; one of "Expression" (defautl, does nothing), "Log2 Expression" (returns log2(x + 1) for every value), "Mean Scaled" (each row is scaled by its average), "Z-score" (each row is centered and scaled to mean = 0 and sd = 1)
Examples
mat = matrix(1:10, nrow = 2, ncol = 5)
rescale_matrix(mat, type = "Expression")
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 1 3 5 7 9
#> [2,] 2 4 6 8 10
rescale_matrix(mat, type = "Log2 Expression")
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 1.000000 2.000000 2.584963 3.000000 3.321928
#> [2,] 1.584963 2.321928 2.807355 3.169925 3.459432
rescale_matrix(mat, type = "Mean Scaled")
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] 0.2000000 0.6000000 1 1.400000 1.800000
#> [2,] 0.3333333 0.6666667 1 1.333333 1.666667
rescale_matrix(mat, type = "Z-score")
#> [,1] [,2] [,3] [,4] [,5]
#> [1,] -1.264911 -0.6324555 0 0.6324555 1.264911
#> [2,] -1.264911 -0.6324555 0 0.6324555 1.264911
#> attr(,"scaled:center")
#> [1] 5 6
#> attr(,"scaled:scale")
#> [1] 3.162278 3.162278