— Loadable Function: spfind (x)
— Loadable Function: spfind (x, n)
— Loadable Function: spfind (x, n, direction)
— Loadable Function: [i, j, v spfind (...)

A sparse version of the find function. Please see the find for details of its use.

Note that this function is particularly useful for sparse matrices, as it extracts the non-zero elements as vectors, which can then be used to create the original matrix. For example,

          sz = size(a);
          [i, j, v] = spfind (a);
          b = sparse(i, j, v, sz(1), sz(2));
     

See also: sparse.