Loop insider a loop Plot, Please Help

2014 1 22
2 个回答
回答已采纳
更新时间：2014 1 23
8 次查看（30 天）

0 个投票

I need to plot a t vs. s diagram. The function is: s = (sigma - 3 + 0.072 * t * (1 + 0.072 * t)) / 0.77. I'm dying to know why the loop inside loop does not give me the correct plot. Thank you so much.
INCORRECT:
clear all;
Sigma = 0:5:30;
T = 0:1:30;
for sigma = 1:length(Sigma);
for t = 1:length(T);
s(sigma,t) = (sigma-3+0.072*t*(1+0.072*t))/0.77;
end;
end;
plot(s,T)
CORRECT:
clear all;
Sigma = 5:5:30;
T = 0:1:30;
for t = 1:length(T);
s(Sigma,t) = (Sigma-3+0.072*t*(1+0.072*t))/0.77;
end;
plot(s,T);
Thank you.*

请先登录，再回答此问题。

 采纳的回答

Walter Roberson
Walter Roberson 2014-1-22

0 个投票

In your first version, you have
for sigma = 1 : length(Sigma)
which makes sigma 1, 2, 3, ... up to the number of values in Sigma.
In your second version, you use Sigma in your calculation, which uses the contents of Sigma rather than the numbers up to the length of Sigma.
Fix:
s(sigma,t) = (Sigma(sigma)-3+0.072*t*(1+0.072*t))/0.77;

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-1-22

1 个投票

clear
Sigma = 5:5:30;
n=numel(Sigma)
t = linspace(0,30,n);
s=zeros(1,n);
for k = 1:n;
s(k) = (Sigma(k)-3+0.072*t(k)*(1+0.072*t(k)))/0.77;
end;
plot(t,s);

类别

在 帮助中心 和 File Exchange 中查找有关 Graphics Objects 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by