Appending vector in long for-loop

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Jonathan
Jonathan 2013-11-8
编辑： Azzi Abdelmalek 2013-11-11
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

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-8
编辑：Azzi Abdelmalek 2013-11-8
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
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Azzi Abdelmalek
Azzi Abdelmalek 2013-11-9
We don't know how y varies, how your function percentChange works.
Jonathan
Jonathan 2013-11-11
编辑：Azzi Abdelmalek 2013-11-11
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;

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