/usr/share/freemat/toolbox/sparse/spy.m is in freemat-data 4.0-5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | % SPY SPY Visualize Sparsity Pattern of a Sparse Matrix
%
% Usage
%
% Plots the sparsity pattern of a sparse matrix. The syntax for its use is
%
% spy(x)
%
% which uses a default color and symbol. Alternately, you can use
%
% spy(x,colspec)
%
% where colspec is any valid color and symbol spec accepted by plot.
% Copyright (c) 2002-2006 Samit Basu
% Licensed under the GPL
function spy(A,colspec)
if (nargin==1)
colspec = 'r.';
end
[i,j] = find(A);
plot(i,j,colspec)
xlabel(sprintf('nz = %d',int32(nnz(A))));
set(gca,'ydir','reverse');
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