Generate sparse data from an upper triangle — rs_upper_triangle_to

This function takes the values from an upper triangle matrix, the shift and the nrows/ncols and returns the full symmetric matrix as a compressed sparse list.

Usage

rs_upper_triangle_to_sparse(value, shift, n, cs_type)

Arguments

value: Numeric vector. The upper triangle values.
shift: Boolean. Was the matrix shifted up (FALSE = diagonal included; TRUE = diagonal not included).
n: Integer. The number of columns/rows in the symmetric matrix.
cs_type: String. One of c("csr", "csc"). Which type of list to return. Other values raise an error.

Value

A list containing:

data - Numeric vector with the non-zero values.
indptr - Integer vector with the index pointers.
indices - Integer vector with the 0-based indices.
nrow - Number of rows.
ncol - Number of columns.
cs_type - "csr" or "csc".