MATLAB: If statement does not execute the statements

if statement

I can't understand what I'm doing wrong here; basically I have two matrices, A and B, and if one of the two matrices has a row in which every entry is equal to NaN, I want to delete the corresponding row in the other matrix as well. This is the code I used:
A1 = A;
B1 = B;
for i = 1 : size(A,1)
    if sum(isnan(A(i,2:end)))==size(A(:,2:end),2) || ...
            sum(isnan(B(i,2:end)))==size(B(:,2:end),2);
        A1(i,:) = []
        B1(i,:) = [];
    end
end
However, in matrix B1 there are still many rows entirely made of NaN values. Why is this not working?

Best Answer

If I understand correctly what you want to do, this should work:
A = randi(9, 7, 4);                                         % Create Matrices

B = randi(9, 7, 4);                                         % Create Matrices
A([2 6],:) = NaN;                                           % Create ‘NaN’ Rows In ‘A’
B(4,:) = NaN;                                               % Create ‘NaN’ Rows In ‘B’
row_idx = all(isnan(A),2) | all(isnan(B),2);                % Logical Index For ‘NaN’ Rows In Both
A(row_idx,:) = [];                                          % Delete Rows In ‘A’
B(row_idx,:) = [];                                          % Delete Rows In ‘B’
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