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% SPOK : checks the validity of a built-in 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. A built-in 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://suitesparse.com
% SPDX-License-Identifier: Apache-2.0
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