MATLAB: Compare index 1 to index s within loop. index exceed matrix dim

index comparison

I have 12 files (M) each with 12 columns to which I want to compare each file columns to another file columns.

for s =1:numel(M)
     if all(strcmpi(M(1),M(s))) == 1
        M = M(s);
     end
  end

However, I am getting index exceed matrix dimension. Any help as to how to improve this loop would be nice.

Best Answer

The first time the test succeeds, you are going to replace your array M with the single element M(s) . That leaves M as only a single element long, so the next iteration of the loop attempting to index it by anything other than 1 is going to fail.

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MATLAB: Can this be done without a for loop

The following will put all elements above your threshold value to 0.

[row, col, index] = find( M > threshold);
M(index) = 0;

This next part will put the -1 at the first element like you want.

for i = 1:length(row)
    if(i > 1)
       if(row(i) < row(i-1))
          %the previous row was larger than the current row, break the loop
          break;
       end
    end
    %found the first element of the row that exceeds the threshold
    M(row(i),col(i)) = -1;
 end

Another option, is to do a loop and look at it row by row.

   [row, col] = size(M);
   for i = 1:row
       index = find(M(i,:) > threshold, 1);
   if(exists(index))
M(i,index) = -1;
   M(i,index+1:end) = zeros(1,col-index);
   end
   end

MATLAB: Indexing

I0=find(x==0)
I30=find(x==-30)

Best Answer

Related Solutions

MATLAB: Can this be done without a for loop

MATLAB: Indexing

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