Check if all row elements are 0 in FBM

Check if all row elements in a FBM are 0. This is used to clean up the super-subject matrix in mask_cortex.

Usage

fbm_col_has_0(
  X,
  n_cores = 1,
  row.ind = bigstatsr::rows_along(X),
  col.ind = bigstatsr::cols_along(X),
  row.mask = NULL,
  col.mask = NULL
)

Arguments

X

: the file-backed matrix (FBM) object

n_cores

: (default = 1) number of cores for parellalization

row.ind

: indicator for rows

col.ind

: indicator for columns

row.mask

: (default = NULL) specify a subset of rows

col.mask

: (default = NULL) specify a subset of columns

Value

A (large) logical vector for where rows are all 0.

Author

Serena Defina, 2024.