i want to use nchoosek command in FOR loop in decreasing order for decoding process, it works in increasing order in FOR loop for encoding , Any suggestions

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Junaid Khan 2016-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/311562-i-want-to-use-nchoosek-command-in-for-loop-in-decreasing-order-for-decoding-process-it-works-in-inc

评论： Junaid Khan 2016-11-10

m=4;
r=4; 
%%%%%%%%%%%%%%%%%%%
for a=r:2
v=1:1:m;
   % Making combinations in decreasing order, but it is not working         
c = nchoosek(v, a); 
end

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Answer 1

Guillaume 2016-11-10

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When you write a:b, matlab generates all numbers from a (included) to b (maybe included) in increments of +1. If b is smaller than one, no number is generated

If you want a different step than the default +1 you have to specify it explicitly. a:step|b, so:

for a = r:-1:2

See the documentation for more details