How to use gplot for co-ordinates

2013 9 2
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I very simply want to use gplot for two vectors (x and y), such that they create 5 co-ordinates.
How do I do this? (syntax-wise)
Thanks a lot

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Dishant Arora
Dishant Arora 2013-9-2

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gplot(eye(length(x)) , [x' , y'], '*');
% x and y are row vectors containing co-ordinates.

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Brian
Brian 2013-9-2

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It says "??? Index exceeds matrix dimensions."
Really don't know what I'm doing wrong.
Thanks for your help

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Dishant Arora
Dishant Arora 2013-9-2
You need to show your piece of code. saying "index exceeds matrix dimensions" wouldn't help. And did you try to debug it
Brian
Brian 2013-9-2
figure; axis([0 15 0 15]); hold on; uiwait(msgbox('click 5 points in the figure to fit a curve through')); [x, y] = ginput(5); plot(x,y,'x');
f=[x';1,1,1,1,1]'
a=inv(f'*f)*f'*y
t= [0:0.01:15]; b=a([1],:) d=a([2],:) c=(b + d*t); figure; axis([0 15 0 15]); hold on; plot(x,y,t,c)
gplot(eye(length(x)) , [x' , y'], '*');
How do I debug it?
Dishant Arora
Dishant Arora 2013-9-2
As I said earlier in my answer x and y were row vectors but in your case ginput returns x and y as column vectors. you need to take care of that .
Brian
Brian 2013-9-2
It draws from one point to another, I want each point to connect to each other, how do I do this?
Thanks
(this is the current code: gplot(eye(length(x)) , [x , y], '*');gplot(eye(length(x)) , [x , y], '*'); )
Dishant Arora
Dishant Arora 2013-9-2
use ones matrix instead of identity matrix as argument in gplot.
gplot(ones(length(x)), [x , y])
Brian
Brian 2013-9-2
Thanks a lot, works perfect

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