SparsePointers: Convert sparse matrix pointers to indices and vice versa

In mojaveazure/seurat-disk: Interfaces for HDF5-Based Single Cell File Formats

Convert sparse matrix pointers to indices and vice versa

Description

Convert sparse matrix pointers to indices and vice versa

Usage

IndexToPointer(j)

PointerToIndex(p)

Arguments

j	A vector of sparse matrix colum indices
p	A vector of sparse matrix pointers

Value

IndexToPointer: A vector of index pointers (p)

PointerToIndex: A vector of column (j) indices

Author(s)

PointerToIndex was written by Josh O'Brien on StackOverflow

Source

PointerToIndex came from StackOverflow

Examples

dat <- dat <- c(0, 0, 1, 4, 0, 2, 0, 9, 0)
smat <- Matrix::Matrix(data = dat, nrow = 3, sparse = TRUE)
j <- SeuratDisk:::PointerToIndex(p = smat@p)
Matrix::sparseMatrix(i = smat@i + 1, j = j, x = smat@x)
p <- SeuratDisk:::IndexToPointer(j = j)
Matrix::sparseMatrix(i = smat@i + 1, p = p, x= smat@x)

mojaveazure/seurat-disk documentation built on Nov. 5, 2023, 9:40 a.m.