MATLAB: How to remove rows

matrixrows

mydata = importdata('data.txt'); A=mydata;

    nRows = size(A, 1);
    nColumns = size(A,2);
        for i=1: nRows
            if (nnz(A(i,:)<3540) == 15)
                A(i,:)=[];
            end
        end

Best Answer

You don't need to loop

 A(sum(A < 3540, 2) == 15,:) = [];

Related Solutions

MATLAB: Delete every n rows if less than x

Assuming that m is a multiple of 24:

DataM  = reshape(Data, 24, [], 14);
Match  = (DataM(14, :, 5) >= x);
Result = reshape(DataM(:, Match, :), [], 14);

For teaching with a FOR loop:

Keep = true(1, size(Data, 1));
for k = 1:24:size(Data, 1)
  Keep(k:k+23) = (Data(k+4, 14) >= x);
end
Result = Data(Keep, :);

MATLAB: Setting up vector function

In your for loop, you are using k(k1+1). if k1 is the last element of k, then k(k1+1) will be exceeding the dimension of k. If you dont care about the last term, use

 for k1 = 1:n-1
     ... Stuff ...
 end
 d(n) = k(n);

or if you need the other vectors to go to n, stick it in a conditional

 for k1 = 1:n
     ... Other Stuff ...
     if k1~=n
         d = (k(k1)+k(k1+1))*ones(n,1);
     end
 end

Best Answer

Related Solutions

MATLAB: Delete every n rows if less than x

MATLAB: Setting up vector function

Related Question