Why can't I plot such an easy graph?

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

[Stephen23]

Learn how to vectorize in MATLAB:

http://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

Answer 1

[Jacob]

Use

v = 1:100;
x(1,:) = 1+2.*v;
y(1,:) = 3+v;
plot(x,y)

Why loop when you don't have to?

Answer 2

[Azzi Abdelmalek]

for i = 1:100
 x(i) = 1 + 2*i;
 y(i) = 3 + i;
end
plot(x,y)

[Moj]

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]

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!