Cody

# Problem 793. Combinations without using nchoosek

Solution 104743

Submitted on 29 Jun 2012 by @bmtran (Bryant Tran)
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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) [a,b] = meshgrid(1:n); output = [nonzeros(tril(a,-1)) nonzeros(tril(b,-1))]; end %This code written by profile_id 2722350

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) [a,b] = meshgrid(1:n); output = [nonzeros(tril(a,-1)) nonzeros(tril(b,-1))]; end %This code written by profile_id 2722350

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) [a,b] = meshgrid(1:n); output = [nonzeros(tril(a,-1)) nonzeros(tril(b,-1))]; end %This code written by profile_id 2722350

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) [a,b] = meshgrid(1:n); output = [nonzeros(tril(a,-1)) nonzeros(tril(b,-1))]; end %This code written by profile_id 2722350

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