Cody

# Problem 793. Combinations without using nchoosek

Solution 1693360

Submitted on 16 Dec 2018
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### Test Suite

Test Status Code Input and Output
1   Fail
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')))

Error using horzcat Dimensions of arrays being concatenated are not consistent. Error in your_fcn_name (line 4) a=[a; repmat(i,n-i,1) (i+1:n)]; Error in Test1 (line 3) assert(isequal(your_fcn_name(n),y_correct))

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 using horzcat Dimensions of arrays being concatenated are not consistent. Error in your_fcn_name (line 4) a=[a; repmat(i,n-i,1) (i+1:n)]; Error in Test2 (line 3) assert(isequal(your_fcn_name(n),y_correct))

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 using horzcat Dimensions of arrays being concatenated are not consistent. Error in your_fcn_name (line 4) a=[a; repmat(i,n-i,1) (i+1:n)]; Error in Test3 (line 3) assert(isequal(your_fcn_name(n),y_correct))

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 a = your_fcn_name(n) a=[]; for i=1:n-1 a=[a; repmat(i,n-i,1) (i+1:n)]; end end %This code written by profile_id 8179227 '