R/rowCummins.R

In DelayedMatrixStats: Functions that Apply to Rows and Columns of 'DelayedMatrix' Objects

### ============================================================================
### rowCummins
###

### ----------------------------------------------------------------------------
### Non-exported methods
###

.DelayedMatrix_block_rowCummins <- function(x, rows = NULL, cols = NULL,
                                            ...) {
  # Check input type
  stopifnot(is(x, "DelayedMatrix"))
  DelayedArray:::.get_ans_type(x, must.be.numeric = TRUE)

  # Subset
  x <- ..subset(x, rows, cols)

  # Compute result
  val <- rowblock_APPLY(x = x,
                        FUN = rowCummins,
                        ...)
  if (length(val) == 0L) {
    return(numeric(ncol(x)))
  }
  # NOTE: Return value of matrixStats::rowCummins() has no names
  unname(do.call(rbind, val))
}

### ----------------------------------------------------------------------------
### Exported methods
###

# ------------------------------------------------------------------------------
# General method
#

#' @inherit MatrixGenerics::rowCummins
#' @importMethodsFrom DelayedArray seed
#' @rdname colCummaxs
#' @export
#' @examples
#'
#' # Only use rows 2-4
#' rowCummins(dm_Matrix, rows = 2:4)
setMethod("rowCummins", "DelayedMatrix",
          function(x, rows = NULL, cols = NULL, 
                   force_block_processing = FALSE, ...) {
            .smart_seed_dispatcher(x, generic = MatrixGenerics::rowCummins, 
                                   blockfun = .DelayedMatrix_block_rowCummins,
                                   force_block_processing = force_block_processing,
                                   rows = rows,
                                   cols = cols,
                                   ...)
          }
)