creating point graph problem

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tevzia
tevzia on 25 Oct 2013
Commented: Walter Roberson on 28 Oct 2013
Hi, I have two different matrices and I try to create point graph with those matrices.
I use:
plot(x,y,'*')
but x and y has 100 value in it when i create plot(x) and plot(y) its a line graph and includes 100 value. when i combine them point graph only shows 10. How could i fix it or add range for the plot

Answers (1)

Walter Roberson
Walter Roberson on 25 Oct 2013
It could be that you only have 10 distinguishable pairs.
See what you get if you use
unique([x(:),y(:)], 'rows')
  11 Comments
tevzia
tevzia on 27 Oct 2013
all of the length is 10. code is
x = load('hadi.dat');
y = load('yok.dat');
figure
plot(x,y,'*')
set(gcf,'numbertitle','off','name','NPV')
Walter Roberson
Walter Roberson on 28 Oct 2013
Let's go back to my earlier question
Okay, so if I give you the xy pairs x = [3 3 5], y = [1 1 2], then how many points would you expect to see plotted by plot(x, y, '*') ?
you answered (correctly) that there are only 2 unique points so only 2 values would be plotted.
Now, if you were to use
plot(x)
or
plot(y)
you would see 3 points plotted on each. So why did you not get 3 points out of plot(x,y) ?
With your data, you are doing the same thing: you are seeing 100 different points for plot(x) and plot(y), and from that you are expecting that plot(x,y) would show 100 points -- but just like with the simple example, only some of the point-pairs are unique, so you only see the unique combinations.
I am not sure what you are expecting on your output. Are you expecting a sort of grid plot with one point at the combination of each unique x with each unique y ?

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