82 lines
2 KiB
Matlab
82 lines
2 KiB
Matlab
function info = try3(A,pin);
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% TRY3 : test SUPERLU with 3 outputs
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%
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% info = try3(A,pin);
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% normally info is the residual norm;
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% but info is at least 10^6 if the factors are not triangular,
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% or the permutation isn't a permutation.
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% Copyright (c) 1995 by Xerox Corporation. All rights reserved.
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% HELP COPYRIGHT for complete copyright and licensing notice.
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n = max(size(A));
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info = 0;
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if nargin == 1
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[l,u,pr] = superlu(A);
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elseif nargin == 2
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[l,u,pr] = superlu(A,pin);
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else
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error('requires 1 or 2 inputs');
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end;
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figure(2); spy(l); title('L');
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figure(1); spy(u); title('U');
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drawnow;
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format compact
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disp('SUPERLU with 3 outputs:');
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if any(any(triu(l,1)))
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disp('L is *NOT* lower triangular.');
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info = info + 10^6;
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else
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disp('L is lower triangular.');
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end;
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if nnz(l) == nnz(l+l)
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disp('L has no explicit zeros.');
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else
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disp('L contains explicit zeros.');
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info = info+10^6;
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end;
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if any(any(tril(u,-1)))
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disp('U is *NOT* upper triangular.');
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info = info + 10^6;
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else
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disp('U is upper triangular.');
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end;
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if nnz(u) == nnz(u+u)
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disp('U has no explicit zeros.');
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else
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disp('U contains explicit zeros.');
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info = info+10^6;
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end;
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if pr == [1:n]
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disp('PROW is the identity permutation.');
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elseif isperm(pr)
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disp('PROW is a non-identity permutation.');
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else
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disp('PROW is *NOT* a permutation.');
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info = info + 10^6;
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end;
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if nargin == 1
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rnorm = norm(A(pr,:) - l*u,inf);
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fprintf(1,'||A(PROW,:) - L*U|| = %d\n', rnorm);
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elseif size(pin) == [n n]
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rnorm = norm(A(pr,:)*pin' - l*u,inf);
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fprintf(1,'||A(PROW,:)*PIN'' - L*U|| = %d\n', rnorm);
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elseif max(size(pin)) == n
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rnorm = norm(A(pr,pin) - l*u,inf);
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fprintf(1,'||A(PROW,PIN) - L*U|| = %d\n', rnorm);
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if pr == pin
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disp('PROW is the same as the input permutation.');
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else
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disp('PROW is different from the input permutation.');
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end;
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else
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rnorm = norm(A(pr,:) - l*u,inf);
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fprintf(1,'||A(PROW,:) - L*U|| = %d\n', rnorm);
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end;
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info = info + rnorm;
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disp(' ');
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