Commit 49e53f92 authored by Stéphane Adjemian's avatar Stéphane Adjemian
Browse files

Added isdiagonal routine.

parent 3f496b49
function b = isdiagonal(A) % --*-- Unitary tests --*--
% Copyright (C) 2014 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
if isnumeric(A)
if isquare(A)
% Find non zero elements in matrix A...
[ir, ic] = find(A);
% If the non zero elements are on the diagonal, the corresponding elements
% in ir and ic (row and column numbers) should be equal.
b = isequal(ir, ic);
else
error('isdiagonal: Input must be a square matrix!')
end
else
error('isdiagonal: Input must be numeric!')
end
%@test:1
%$ A = zeros(3,3);
%$ t = isdiagonal(A);
%$ T = all(t);
%@eof:1
%@test:2
%$ A = zeros(3,3); A(1,3) = 1;
%$ t = ~isdiagonal(A);
%$ T = all(t);
%@eof:2
%@test:3
%$ A = randn(3,3);
%$ t = ~isdiagonal(A);
%$ T = all(t);
%@eof:3
%@test:4
%$ A = diag(randn(3,1));
%$ t = isdiagonal(A);
%$ T = all(t);
%@eof:4
%@test:5
%$ A = diag(randn(3,1)); A(1,1) = 0;
%$ t = isdiagonal(A);
%$ T = all(t);
%@eof:5
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment