Calculate the MD5 checksum of an IterableMatrix

Calculate the MD5 checksum of an IterableMatrix and return the checksum in hexidecimal format.

Usage

checksum(matrix)

Arguments

matrix

IterableMatrix object

Value

MD5 checksum string in hexidecimal format.

Details

checksum() converts the non-zero elements of the sparse input matrix to double precision, concatenates each element value with the element row and column index words, and uses these 16-byte blocks along with the matrix dimensions and row and column names to calculate the checksum. The checksum value depends on the storage order so column- and row-order matrices with the same element values give different checksum values. checksum() uses element and index values in little-endian CPU storage order. It converts to little-endian order on big-endian architecture although this has not been tested.

Examples

library(Matrix)
library(BPCells)
m1 <- matrix(seq(1,12), nrow=3)
m2 <- as(m1, 'dgCMatrix')
m3 <- as(m2, 'IterableMatrix')
checksum(m3)
#> [1] "8a6bf37ef376f7d74b4642a2ed0fc58d"