Re: How to extract sequenced data from an array?

[veryhappy]

What about this procedure (warning: It's slooooow):

% We create a random vector
a=round(rand(1,2124)*2);
% Then we repeat it several times and a little more (period=2124)
a=[a,a,a,a,a,a,a(1:2)];
% We find every repetition of first element and discard itself
% Any of those can be the period
ind=find(a==a(1));
ind(1)=[];

[tam]=length(a);
period=0;
for tmp=ind
  tmp=tmp-1;
  % We must calculate how many times we need to repeat the chunk to fill the
matrix
  ntimes=ceil(tam/tmp);
  % Then we create the filled matrix and cut the excess.
  % If it's equal to the initial matrix then we found the period
  if(isequal(a,resize([repmat(a(1:tmp),1,ntimes),a(tmp)],1,tam)))
    period=tmp;
    break;
  endif
endfor
period
-- 
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