matrix.csc-class function

Class "matrix.csc" - Sparse Matrices in [C]ompressed [S]parse [C]olumn Format

A class for sparse matrices stored in compressed sparse column ('csc') format.

class

Objects from the Class

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

Slots

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

Methods

• as.matrix.csr: signature(x = "matrix.csc"): ...
• as.matrix.ssc: signature(x = "matrix.csc"): ...
• as.matrix.ssr: signature(x = "matrix.csc"): ...
• as.matrix: signature(x = "matrix.csc"): ...
• chol: signature(x = "matrix.csc"): ...
• dim: signature(x = "matrix.csc"): ...
• t: signature(x = "matrix.csc"): ...

See Also

matrix.csr-class

Examples

cscM <- as.matrix.csc(as(diag(4:1), "matrix.csr"))
  cscM
  str(cscM)
  stopifnot(identical(dim(cscM), c(4L, 4L)))