Why can't I plot such an easy graph?

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Moj
Moj 2014-12-12
评论： Stephen23 2014-12-18
Dear community,
Why can't I plot such an easy graph?
for i = 1:100
x(1,:) = 1 + 2*i;
y(1,:) = 3 + i;
end
plot(x,y)
I have two arrays, how can I plot this?
Thanks in advance

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采纳的回答

Jacob
Jacob 2014-12-12
Use
v = 1:100;
x(1,:) = 1+2.*v;
y(1,:) = 3+v;
plot(x,y)
Why loop when you don't have to?

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-12-12
for i = 1:100
x(i) = 1 + 2*i;
y(i) = 3 + i;
end
plot(x,y)
  2 个评论
Moj
Moj 2014-12-12
but it doesn't work when we have no integer number for i.
for i = 7e-5:1e-5:3e-4
x(1,:) = 1 + 2*i;
y(1,:) = 3 + i;
end
plot(x,y)
Ilham Hardy
Ilham Hardy 2014-12-12
x(i) not x(1,:)
You loop nothing when i (your loop index) is not used!
PS: Two reasons of not using "i" as a loop index:
  1. 1. "i" is actually square-root of -1
  2. 2. "i" and "1" is quite difficult for human eyes to distinguish!

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