Cody

# Problem 793. Combinations without using nchoosek

Solution 241513

Submitted on 8 May 2013
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### Test Suite

Test Status Code Input and Output
1   Pass
%% n = 3; y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) % Prevents cheating filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

``` filetext = function ans = your_fcn_name(n) triu(true(n),1); [x,y] = meshgrid(1:n); [y(ans) x(ans)]; end %This code written by profile_id 3354683 ```

2   Fail
%% n = 25; y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

```Error: Assertion failed. ```

3   Fail
%% n = 112; y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

```Error: Assertion failed. ```

4   Pass
%% n = 2 y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

``` n = 2 filetext = function ans = your_fcn_name(n) triu(true(n),1); [x,y] = meshgrid(1:n); [y(ans) x(ans)]; end %This code written by profile_id 3354683 ```