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% SPOK : checks the validity of a MATLAB sparse matrix.
%
% This function is of little use for those using purely M-files. It is
% extremely useful for those who write mexFunctions that return sparse matrices
% to MATLAB. A MATLAB sparse matrix is stored in compressed-column form, where
% each column is stored as a list of entries with their row indices and their
% corresponding numerical values. Row indices must appear in ascending order,
% and no explicitly zero numerical entries can appear. Constructing a valid
% sparse matrix in a mexFunction can be difficult. This function will help you
% to know if you've done that correctly.
%
% Files
% spok - checks if a sparse matrix is OK
% spok_install - compiles and installs the SPOK mexFunction
% spok_test - installs and tests SPOK
%
% Example
%
% load west0479
% A = west0479 ;
% spok (A) % double sparse
% spok (A + 1i*A) % complex sparse
% spok (A > .5) % logical sparse
% Copyright 2008-2011, Timothy A. Davis, http://www.suitesparse.com
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