Contents - Index

Sparse matrix functions. 

   Elementary sparse matrices. 
     speye        Sparse identity matrix. 
     sprandn      Sparse random matrix. 
     sprandsym    Sparse symmetric random matrix. 
     spdiags      Sparse matrix formed from diagonals. 
   Full to sparse conversion. 
     sparse       Create sparse matrix from nonzeros and indices. 
     full         Convert sparse matrix to full matrix. 
     find         Find indices of nonzero entries. 
     spconvert    Convert from sparse matrix external format. 
   Working with nonzero entries of sparse matrices. 
     nnz          Number of nonzero entries. 
     nonzeros     Nonzero entries. 
     nzmax        Amount of storage allocated for nonzero entries. 
     spones       Replace nonzero entries with ones. 
     spalloc      Allocate memory for nonzero entries. 
     issparse     True if matrix is sparse. 
     spfun        Apply function to nonzero entries. 
   Visualizing sparse matrices. 
     spy          Visualize sparsity structure. 
     gplot        Plot graph, as in "graph theory". 
   Reordering algorithms. 
     colmmd       Column minimum degree. 
     symmmd       Symmetric minimum degree. 
     symrcm       Reverse Cuthill-McKee ordering. 
     colperm      Order columns based on nonzero count. 
     randperm     Random permutation vector. 
     dmperm       Dulmage-Mendelsohn decomposition. 
   Norm, condition number, and rank. 
     normest      Estimate 2-norm. 
     condest      Estimate 1-norm condition. 
     sprank       Structural rank. 
   Operations on trees. 
     treelayout   Lay out a tree or forest. 
     treeplot     Plot a picture of a tree. 
     etree        Elimination tree of a matrix. 
     etreeplot    Plot the elimination tree. 
     symbfact     Symbolic factorization analysis. 
     spparms      Set parameters for sparse matrix routines. 
     spaugment    Form least squares augmented system.