Cody

# Problem 793. Combinations without using nchoosek

Solution 2177577

Submitted on 27 Mar 2020 by Martha Dick
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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 output = your_fcn_name(n) %Should initialise output here but not going to for i=1:n-1 output(n*(i-1)-i*(i-1)/2+1:n*i - i*(i+1)/2,:) = [ones(n-i,1)*i,((i+1):n)']; end end %This code written by profile_id 17641495 '

2   Pass
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')))

filetext = 'function output = your_fcn_name(n) %Should initialise output here but not going to for i=1:n-1 output(n*(i-1)-i*(i-1)/2+1:n*i - i*(i+1)/2,:) = [ones(n-i,1)*i,((i+1):n)']; end end %This code written by profile_id 17641495 '

3   Pass
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')))

filetext = 'function output = your_fcn_name(n) %Should initialise output here but not going to for i=1:n-1 output(n*(i-1)-i*(i-1)/2+1:n*i - i*(i+1)/2,:) = [ones(n-i,1)*i,((i+1):n)']; end end %This code written by profile_id 17641495 '

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 output = your_fcn_name(n) %Should initialise output here but not going to for i=1:n-1 output(n*(i-1)-i*(i-1)/2+1:n*i - i*(i+1)/2,:) = [ones(n-i,1)*i,((i+1):n)']; end end %This code written by profile_id 17641495 '