Scatter Plot only Non-Zero Set of Points

Hi,

I suppose... Let's say, once you make two tables of values and you decide create a scatter plot, where the row values of one table is plotted against the row values the other... how can you use scatter to plot only the non-zero points in the tables?

For instance,

I had:

x1 = tt5{:,6}
y1 = ss5{:,6}
scatter(x1,y1,'b')
hold on

where

ss5 column 6:
0
1
0
0
1
0
0
0
tt5 column 6:
0
7
6
5
18
6
4
5

So, I would only want to plot (7,1) and (18,1)

[Rik]

Your code would be a lot easier to read if you had written it very differently. If you find yourself having more than two nearly identical blocks of code you should consider making it a loop, or use a function.

You should not be using numbered variables like this. If you had put the results in an array it would probably be a lot easier to solve your question.

[CMatlabWold]

I edited the question. But, I agree.

[Rik]

If you edit away code, can you at least not remove the formatting?

[CMatlabWold]

Do you want me to answer that as "Yes sir?" or "Yes, Boss."

[Rik]

Either will do ;)

It is just a bit frustrating to apply formatting to your question, and then having to do it again because you removed everything including the formatting. The edit controls are right there when you edit you posts, please use them.

[CMatlabWold]

lol I get it

Answer 1

[Sindar]

Here's how to do this with a small example script:

% create a 5x2 array of random integers 0-5 for both x and y
x = randi([0 5],5,2);
y = randi([0 5],5,2);
% identify indices where both x and y are not zero
idx = (x ~= 0) & (y ~= 0);
% plot only these
scatter(x(idx),y(idx))

If this doesn't work with your code, please work to simplify it as Rik suggests

[CMatlabWold]

Hmm... Maybe I made this too much of a loaded question (the code could be better, of course). I should have skipped the code and included only the scatter information. So, I will edit my question...

I suppose... Let's say, once you make two tables of values and you decide create a scatter plot, where the row values of one table is plotted against the row values the other... how can you use scatter to plot only the non-zero points in the tables?

For instance,

scatter(x1,y1,'b')

hold on

where

x1 = tt5{:,6}

y1 = ss5{:,6}

ss5 column 6:

0

1

0

0

1

0

0

0

tt5 column 6:

0

7

6

5

18

6

4

5

So, I would only want to plot (7,1) and (18,1)

[Sindar]

x1 = tt5{:,6};
y1 = ss5{:,6};
% identify indices where both x1 and y1 are not zero
idx = (x1 ~= 0) & (y1 ~= 0);
% plot only these
scatter(x1(idx),y1(idx),'b')

[CMatlabWold]

The zeros do not go away:

[Sindar]

look at the plot, those are 1's. It will look better if you change the ylim:

% get current limits
yl=ylim();
% set new bottom limit to 0
ylim([0 yl(2)])

[CMatlabWold]

You are right. Thank you!