R: Class "matrix.ssr"

matrix.ssr-class {SparseM}

R Documentation

Class "matrix.ssr"

A new class for sparse matrices stored in symmetric sparse row format

Objects can be created by calls of the form new("matrix.ssr", ...).

ra:: Object of class numeric, a real array of nnz elements containing the non-zero elements of the lower triangular part of A, stored in row order. Thus, if i<j, all elements of row i precede elements from row j. The order of elements within the rows is immaterial.
ja:: Object of class integer, an integer array of nnz elements containing the column indices of the elements stored in ‘ra’.
ia:: Object of class integer, an integer array of n+1 elements containing pointers to the beginning of each row in the arrays ‘ra’ and ‘ja’. Thus ‘ia[i]’ indicates the position in the arrays ‘ra’ and ‘ja’ where the ith row begins. The last, (n+1)st, element of ‘ia’ indicates where the n+1 row would start, if it existed.
dimension:: Object of class integer, dimension of the matrix