Cody

# Problem 451. Is this matrix orthogonal?

Solution 68532

Submitted on 31 Mar 2012 by Bruce Raine
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### Test Suite

Test Status Code Input and Output
1   Pass
%% test one x = orth(randn(3)); y_correct = true; assert(isequal(isOrthogonal(x),y_correct))

``` y = 1 ```

2   Pass
%% test two x = orth(randn(4)); y_correct = true; assert(isequal(isOrthogonal(x),y_correct))

``` y = 1 ```

3   Pass
%% test three x = orth(randn(5)); y_correct = true; assert(isequal(isOrthogonal(x),y_correct))

``` y = 1 ```

4   Pass
%% test four x=sqrt([3,1;1,1]); y_correct = false; assert(isequal(isOrthogonal(x),y_correct))

``` y = 0 ```

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 = 2.000402e-18.} {> In isOrthogonal at 3 In verifyCode>evaluateCode at 189 In verifyCode at 37 In fevalJSON at 14} y = 0 ```

6   Pass
%% test six x = randn(2)+1; y_correct = false; assert(isequal(isOrthogonal(x),y_correct))

``` y = 0 ```