turner (version 0.1.9)

matrix_to_blocks: Split a matrix into blocks

Description

Split a matrix into a list of blocks (either by rows or by columns)

Usage

matrix_to_blocks(Matrix, blocks, byrow = TRUE)

Value

A list of matrices

Arguments

Matrix

a matrix to split

blocks

either a list or a vector indicating the blocks. If blocks is a list of vectors, then the length of each vector defines the size of the blocks. If blocks is a vector, then each element represents the size of the blocks.

byrow

logical. If TRUE (the default) the matrix is split by rows, otherwise the matrix is split by columns

Author

Gaston Sanchez

See Also

lengths, listsize

Examples

# matrix with 10 rows and 7 columns
M = matrix(rnorm(70), 10, 7)

# row blocks
row_sets = list(1:3, 4:5, 6:10)

# split matrix by rows
matrix_to_blocks(M, row_sets)

# column blocks
col_sets = c(3, 4)

# split matrix by rows
matrix_to_blocks(M, col_sets, byrow=FALSE)