MATLAB: To find the position of the elements which are same in vector

accumarrayarrayfunhistc

I have a vector like this: a = [ 2 3 4 2 5 4 3 3]; and I want to find all the index of the elements which has the same value. output like this: # 2, [1 4] # 3, [2 7 8] # 4, [3 6] # 5, [5]

Best Answer

find(a==2)

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MATLAB: Find row with certain values

similar to the intersect answer - but I recoded intersect as its quite slow:

x=[1 2 3;4 5 6;3 2 1];
[a b]=find(x==4);
[c d]=find(x==5);
index = c.*NaN;
for kk=1:length(c)
  check =  a(a==c(kk))';
  if ~isempty ( check )
    index(kk) = check;
  end
end
output = index(~isnan(index));

MATLAB: How can i find the position of same elements in matlab……

[a,b1] = unique(x,'first');
[a,b2] = unique(x,'last');
result = [a(:),b1,b2];

ii = [find([true;diff(x(:))~=0]);numel(x)+1];
result=[x(ii(1:end-1))',ii(1:end-1),ii(2:end)-1];

Best Answer

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MATLAB: Find row with certain values

MATLAB: How can i find the position of same elements in matlab……

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