creating point graph problem

2013 10 25
1 个回答
更新时间：2013 10 28
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0 个投票

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

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回答（1 个）

Walter Roberson
Walter Roberson 2013-10-25

0 个投票

It could be that you only have 10 distinguishable pairs.
See what you get if you use
unique([x(:),y(:)], 'rows')

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tevzia
tevzia 2013-10-25
How could i add the graph all of them
Walter Roberson
Walter Roberson 2013-10-25
When you tried the above command, how many entries showed up?
Walter Roberson
Walter Roberson 2013-10-25
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, '*') ? At what coordinates would you expect the points to show up in this small example? What colors and marker shape would you expect for each of those plotted points in this tiny example?
tevzia
tevzia 2013-10-25
2 points because (3,1) are the same location. * shape, blue color
Walter Roberson
Walter Roberson 2013-10-25
Right. Number of points visibly plotted is the number of unique point-pairs. In your data, you have 10 unique point-pairs, and you are getting all 10 plotted.
tevzia
tevzia 2013-10-26
plot(x,y,'*') only picks last 10 points from combination of the matrices not unique 10. non of the points are same. so there is no duplicates. your answer doesnt show or give hint about how to solve this. i already knew it picked 10 pairs
sixwwwwww
sixwwwwww 2013-10-26
Can you please show us your complete code as well as your matrices to sort out the problem then?
Walter Roberson
Walter Roberson 2013-10-26
You said that the output of the unique() had 10 elements: that would indicate that there are 10 unique pairs.
What are the values for
length(unique(x))
length(unique(y))
length(unique([x(:),y(:)], 'rows'))
tevzia
tevzia 2013-10-27
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 2013-10-28
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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tevzia
tevzia
2013-10-25

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Walter Roberson
Walter Roberson
2013-10-28

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