How to use gplot for co-ordinates

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

Answer 1

[Dishant Arora]

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

Answer 2

[Brian]

It says "??? Index exceeds matrix dimensions."

Really don't know what I'm doing wrong.

Thanks for your help

[Dishant Arora]

You need to show your piece of code. saying "index exceeds matrix dimensions" wouldn't help. And did you try to debug it

[Brian]

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]

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]

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]

use ones matrix instead of identity matrix as argument in gplot.

gplot(ones(length(x)), [x , y])

[Brian]

Thanks a lot, works perfect