Cody

# Problem 793. Combinations without using nchoosek

Solution 193509

Submitted on 18 Jan 2013 by Alfonso Nieto-Castanon
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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) cell2mat(arrayfun(@(k)[repmat(k,1,n-k) ; k+1:n],1:n-1,'uni',0))'; end %This code written by profile_id 1379371

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 ans = your_fcn_name(n) cell2mat(arrayfun(@(k)[repmat(k,1,n-k) ; k+1:n],1:n-1,'uni',0))'; end %This code written by profile_id 1379371

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 ans = your_fcn_name(n) cell2mat(arrayfun(@(k)[repmat(k,1,n-k) ; k+1:n],1:n-1,'uni',0))'; end %This code written by profile_id 1379371

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) cell2mat(arrayfun(@(k)[repmat(k,1,n-k) ; k+1:n],1:n-1,'uni',0))'; end %This code written by profile_id 1379371