make rectangular with vectors

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blunder
blunder on 20 Mar 2020
Commented: blunder on 21 Mar 2020
Hi
I write a code for making a rectangular but I have a problem to show one of the sides
I appreciate you for your help
thanks
a=[-1,-1];
b=[-1,1];
c=[1,1];
d=[1,-1];
plot(a,c,'-ok')
hold on
plot(b,c,'-ok')
plot(b,d,'-ok')
plot(c,d,'-ok')
plot(d,a,'-ok')
plot(b,a,'-ok')
plot(b,d,'-ok')
axis([-2,2,-2,2])

Accepted Answer

the cyclist
the cyclist on 20 Mar 2020
Edited: the cyclist on 20 Mar 2020
You say that you have a problem with "one" of your lines, but I think you have a deeper conceptual problem with how you tried to do this.
Look at the result of just this code:
a=[-1,-1];
b=[-1,1];
figure
plot(b,a,'-ok')
axis([-2,2,-2,2])
I assume you are intending your point "a" to be the bottom left, and point "b" to be the upper right. But the syntax you used to make the plot is not accurate in that case. When you do
plot(x,y)
you need to make sure that it is that all x coordinates are the first input, and all the y coordinates are the second input. So the line you want would be plotted like this:
a=[-1,-1];
b=[-1,1];
figure
plot([b(1) a(1)],[b(2) a(2)],'-ok')
axis([-2,2,-2,2])
I would do your whole rectangle like this:
x = [-1 -1 1 1 -1]; % All of the x coordinates
y = [-1 1 1 -1 -1]; % All of the y coordinates
figure
plot(x,y,'-ok')
axis([-2,2,-2,2])
  1 Comment
blunder
blunder on 21 Mar 2020
thanks for your help
In every condition I had at least one problem with one side or one diameter
after I see your recommendation In last paragraph I found my problem.
x = [-1 -1 1 1 -1]; % All of the x coordinates
y = [-1 1 1 -1 -1]; % All of the y coordinates
I must to follow my direction
So for draw diameters:
x = [-1 -1 1 1 -1 1 -1 1];
y = [-1 1 1 -1 -1 1 1 -1];
figure
plot(x,y,'-ok')
axis([-2,2,-2,2])
thanks a lot

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More Answers (1)

madhan ravi
madhan ravi on 20 Mar 2020
plot(a,b,'-ok') % look here
plot(b,c,'-ok')
plot(c,d,'-ok')
plot(d,a,'-ok')

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