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GNU Octave Manual Version 3
by John W. Eaton, David Bateman, Søren Hauberg
Paperback (6"x9"), 568 pages
ISBN 095461206X
RRP £24.95 ($39.95)

Get a printed copy>>> Sparse Functions

Many of the internal functions of Octave, such as diag, cannot accept sparse matrices as an input directly. The sparse implementation uses the dispatch function to overload these functions with equivalent functions that work with sparse matrices. The sparse matrix version of any function can be also used explicitly calling its function name.

The table below lists all of the sparse functions of Octave. The names of the sparse forms of the functions are typically the same as the general versions with a sp prefix. In the table below, and the rest of this chapter the sparse versions of the function names are used.

Generate sparse matrices:
spalloc, spdiags, speye, sprand, sprandn, sprandsym
Sparse matrix conversion:
full, sparse, spconvert
Manipulate sparse matrices
issparse, nnz, nonzeros, nzmax, spfun, spones, spy
Graph Theory:
etree, etreeplot, gplot, treeplot
Sparse matrix reordering:
amd, ccolamd, colamd, colperm, csymamd, dmperm, symamd, randperm, symrcm
Linear algebra:
matrix_type, normest, condest, sprank spaugment
Iterative techniques:
luinc, pcg, pcr
spparms, symbfact, spstats

Note that all of the standard Octave math functions that take a single argument, such as abs, etc can accept sparse matrices.

ISBN 095461206XGNU Octave Manual Version 3See the print edition