Appending vector in long for-loop

I have this loop where x = 62012:

while y < x

    p1  = percentChange(avgLine(y-9), avgLine(y-8));
    p2  = percentChange(avgLine(y-9), avgLine(y-7));
    p3  = percentChange(avgLine(y-9), avgLine(y-6));
    p4  = percentChange(avgLine(y-9), avgLine(y-5));
    p5  = percentChange(avgLine(y-9), avgLine(y-4));
    p6  = percentChange(avgLine(y-9), avgLine(y-3));
    p7  = percentChange(avgLine(y-9), avgLine(y-2));
    p8  = percentChange(avgLine(y-9), avgLine(y-1));
    p9  = percentChange(avgLine(y-9), avgLine(y-0));
    p10 = percentChange(avgLine(y-9), avgLine(y+1));

During this loop, I want to create a vector: [p1 p2 p3 ... p10] and after every iteration, there would be 10 new elements added to the end of it. Can I do this efficiently without using 'append'?

Thanks in advance

Answer 1

[Azzi Abdelmalek]

out=zeros(1,62012*10);
n=0;
while y < x
  n=n+1;
  for k=1:10
      out(1,k+(n-1)*10)= percentChange(avgLine(y-9), avgLine(y+k-9));
  end
end

[Jonathan]

This still takes my program 76 seconds to run while this takes Python only 5-7s

[Azzi Abdelmalek]

We don't know how y varies, how your function percentChange works.

[Jonathan]

function [ x ] = percentChange( startPoint, currentPoint )
format long
x = ((currentPoint - startPoint)/abs(startPoint))*100.00;
if x==0
  x = 0.00000000001;
end

After each loop, y = y+1;