Problem 451. Is this matrix orthogonal?

Solution 66297

Submitted on 27 Mar 2012 by Ben Petschel

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Test	Status	Code Input and Output
1	Pass	%% test one x = orth(randn(3)); y_correct = true; assert(isequal(isOrthogonal(x),y_correct))
2	Pass	%% test two x = orth(randn(4)); y_correct = true; assert(isequal(isOrthogonal(x),y_correct))
3	Pass	%% test three x = orth(randn(5)); y_correct = true; assert(isequal(isOrthogonal(x),y_correct))
4	Pass	%% test four x=sqrt([3,1;1,1]); y_correct = false; assert(isequal(isOrthogonal(x),y_correct))
5	Pass	%% test five x = magic(6); y_correct = false; assert(isequal(isOrthogonal(x),y_correct)) {Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.600321e-18.} {> In isOrthogonal at 2 In verifyCode>evaluateCode at 189 In verifyCode at 37 In fevalJSON at 14}
6	Pass	%% test six x = randn(2)+1; y_correct = false; assert(isequal(isOrthogonal(x),y_correct))