63 lines
1.5 KiB
Matlab
63 lines
1.5 KiB
Matlab
function b = isdiag(A) % --*-- Unitary tests --*--
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% Copyright (C) 2014-2017 Dynare Team
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%
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% This file is part of Dynare.
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%
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% Dynare is free software: you can redistribute it and/or modify
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% it under the terms of the GNU General Public License as published by
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% the Free Software Foundation, either version 3 of the License, or
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% (at your option) any later version.
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%
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% Dynare is distributed in the hope that it will be useful,
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% but WITHOUT ANY WARRANTY; without even the implied warranty of
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% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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% GNU General Public License for more details.
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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
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if isnumeric(A)
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if isquare(A)
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% Find non zero elements in matrix A...
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[ir, ic] = find(A);
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% If the non zero elements are on the diagonal, the corresponding elements
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% in ir and ic (row and column numbers) should be equal.
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b = isequal(ir, ic);
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else
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error('isdiag: Input must be a square matrix!')
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end
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else
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error('isdiag: Input must be numeric!')
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end
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%@test:1
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%$ A = zeros(3,3);
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%$ t = isdiag(A);
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%$ T = all(t);
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%@eof:1
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%@test:2
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%$ A = zeros(3,3); A(1,3) = 1;
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%$ t = ~isdiag(A);
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%$ T = all(t);
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%@eof:2
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%@test:3
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%$ A = randn(3,3);
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%$ t = ~isdiag(A);
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%$ T = all(t);
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%@eof:3
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%@test:4
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%$ A = diag(randn(3,1));
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%$ t = isdiag(A);
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%$ T = all(t);
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%@eof:4
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%@test:5
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%$ A = diag(randn(3,1)); A(1,1) = 0;
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%$ t = isdiag(A);
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%$ T = all(t);
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%@eof:5
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