Per-matrix version counter. — matrix_version

Returns the monotonic counter for the name matrix on (rows_axis, columns_axis). Mirrors Julia DAF: incremented every time set_matrix is called (NOT on delete_matrix or relayout_matrix). Returns 0L if never set.

Usage

matrix_version_counter(daf, rows_axis, columns_axis, name)

Arguments

daf: A DafReader.
rows_axis, columns_axis: Axis names.
name: Matrix name.

Value

integer(1).

Examples

# Mirrors readers.jl jldoctest at line 1088.
m <- example_metacells_daf()
matrix_version_counter(m, "gene", "metacell", "fraction") # 1L
#> [1] 1
set_matrix(m, "gene", "metacell", "fraction",
           matrix(stats::runif(683L * 7L), 683L, 7L),
           overwrite = TRUE)
matrix_version_counter(m, "gene", "metacell", "fraction") # 2L
#> [1] 2