Cody

# Problem 1038. Change the sign of even index entries of the reversed vector

Solution 164099

Submitted on 19 Nov 2012
This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

### Test Suite

Test Status Code Input and Output
1   Pass
x = [4 -5 -2 9]; y_correct = [9 2 -5 -4]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 ans = 9 -2 -5 4 ans = 9 2 -5 -4```

2   Pass
x = ones(1,4); y_correct = [1 -1 1 -1]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 ans = 1 1 1 1 ans = 1 -1 1 -1```

3   Pass
x = 1:10; y_correct = [10 -9 8 -7 6 -5 4 -3 2 -1]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 1 -1 1 -1 1 -1 ans = 10 9 8 7 6 5 4 3 2 1 ans = 10 -9 8 -7 6 -5 4 -3 2 -1```

4   Pass
x = 2:2:12; y_correct = [12 -10 8 -6 4 -2]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 1 -1 ans = 12 10 8 6 4 2 ans = 12 -10 8 -6 4 -2```

5   Fail
x = -3:3; y_correct = [3 -2 1 0 -1 2 -3]; assert(isequal(your_fcn_name(x),y_correct))

```Error using repmat Replication factors must be a row vector of integers or integer scalars. Error in your_fcn_name (line 3) a=repmat([1 -1],1,numel(x)/2) Error in TestPoint5 (line 3) assert(isequal(your_fcn_name(x),y_correct))```

6   Pass
x = [1 1 2 3 5 8 13 21 34 55 89 144]; y_correct = [144 -89 55 -34 21 -13 8 -5 3 -2 1 -1]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 ans = 144 89 55 34 21 13 8 5 3 2 1 1 ans = 144 -89 55 -34 21 -13 8 -5 3 -2 1 -1```

7   Pass
x = [1 0 1 0 1 0 1 0 1 0 1 0]; y_correct = [0 -1 0 -1 0 -1 0 -1 0 -1 0 -1]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 ans = 0 1 0 1 0 1 0 1 0 1 0 1 ans = 0 -1 0 -1 0 -1 0 -1 0 -1 0 -1```

8   Pass
x = [0 1 0 2 0 3 0 4 0 5 0 6]; y_correct = [6 0 5 0 4 0 3 0 2 0 1 0]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 ans = 6 0 5 0 4 0 3 0 2 0 1 0 ans = 6 0 5 0 4 0 3 0 2 0 1 0```

9   Pass
x = [0 1 0 1 0 1 0 1 0 1 0 1]; y_correct = [x(2:end) x(1)]; assert(isequal(your_fcn_name(x),y_correct))

```a = 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1 ans = 1 0 1 0 1 0 1 0 1 0 1 0 ans = 1 0 1 0 1 0 1 0 1 0 1 0```