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function test4
%TEST4 test cholmod2 with multiple and sparse right-hand-sides
% Example:
% test4
% See also cholmod_test
% Copyright 2007, Timothy A. Davis, http://www.suitesparse.com
fprintf ('=================================================================\n');
fprintf ('test4: test cholmod2 with multiple and sparse right-hand-sides\n') ;
Prob = ssget ('HB/bcsstk01') ;
A = Prob.A ;
n = size (A,1) ;
b = rand (n,1) ;
x = cholmod2 (A,b) ;
m2 = norm (A*x-b,1) ;
b = sparse (b) ;
x = cholmod2 (A,b) ;
m2 = max (m2, norm (A*x-b,1)) ;
m1 = 0 ;
for nrhs = 1:80
b = sparse (rand (n,nrhs)) ;
x = A\b ;
e1 = norm (A*x-b,1) ;
x = cholmod2 (A,b) ;
e2 = norm (A*x-b,1) ;
if (e2 > 1e-11)
error ('!') ;
end
m1 = max (m1, e1) ;
m2 = max (m2, e2) ;
end
for nrhs = 1:80
b = sprandn (n, nrhs, 0.01) ;
x = A\b ;
% nnz (x) / (n*nrhs)
e1 = norm (A*x-b,1) ;
x = cholmod2 (A,b) ;
e2 = norm (A*x-b,1) ;
if (e2 > 1e-11)
error ('!') ;
end
m1 = max (m1, e1) ;
m2 = max (m2, e2) ;
end
fprintf ('maxerr %e %e\n', m1, m2) ;
if (m1 > 1e-11 | m2 > 1e-11) %#ok
error ('!') ;
end
fprintf ('test4 passed\n') ;
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