How to avoid a loop using vectors?

2013 11 9
1 个回答
更新时间：2013 11 9
2 次查看（30 天）

0 个投票

Hi, Is there a way to avoid using a for loop (or any loop for that matter) in the following?:
h=(10^-1).^[1:8];
x=pi;
r=5e-6.*rand(16,1);
for i=1:8
fminush(i)=cos(x-h(i))+r(i);
fplush(i)=cos(x+h(i))+r(i+8);
end
fder=(fplush-fminush)./(2*h);
plot(log(h),log(abs(-sin(x)-fder)))
I have tried redefining r to be of size 8 then adding it to both fminush and fplush, to no avail. Matlab would still alert for "matrix dimensions must agree". I'd be thankful for some advice.

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-11-9
编辑：Azzi Abdelmalek 2013-11-9

0 个投票

h=(10^-1).^[1:8];
x=pi;
r=5e-6.*rand(1,16);
fminush1=cos(x-h)+r(1:8);
fplush1=cos(x+h)+r(9:16)
fder=(fplush-fminush)./(2*h);
plot(log(h),log(abs(-sin(x)-fder)),'r')

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