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Matlab code natural numbers subset

  1. Sep 21, 2012 #1
    I have array of natural numbers from 1 to n.
    They are divided into m groups, where m*(m-1)=n.
    I need all m-1 elements from first group, last m-2 elements from second group, last m-3 elements from third group...zero elements from last group.
    For example
    5*4=20:
    1,2,3,4; 5,6,7,8; 9,10,11,12; 13,14,15,16; 17,18,19,20;.
    I need 1,2,3,4; 6,7,8; 11,12; 16;
    Thanks!
     
  2. jcsd
  3. Sep 21, 2012 #2
    Here is a brute force, inelegant, solution to your problem using cell arrays to hold to the final values since they are not equal in size. Do with it as you will :p

    Code (Text):
    m = 5;
    n = m*(m-1);
    numbers = 1:n;

    for i = 1:m
       
        j = i-1;
       
        group(i,:) = numbers((m-1)*j+1:(m-1)*i);
       
        group_ends{i} = group(i,i:end);
       
    end
     
  4. Sep 21, 2012 #3
    Thank you!!!
     
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