how to deal with this error??

When i write the code i get *The variable'DG4' appears to change size on every loop iteration(within a script). Consider preallocating for speed

What should i do??

         t4=122;
         n4=2000;
         for i=1:n4
                if abs(d4(i))>t4
                   DG4(i)=d4(i)-((t4.^2)/d4(i));

                end
          end

d4 is a signal of 1x2000 double

Answer 1

[Birdman]

At the beginning of the code, write

DG4=zeros(1,2000);

[Image Analyst]

DG4 is NOT from that code. It's not mentioned anywhere in that code.