Extracting y-data from ezplot.

Dear everyone

I've created a plot using ezplot, and I want to extract the ydata. Now I have used the get(object,'YData'), but all I get are the y-axis values. I'm doing the following:

cd=ezplot('1.5*x.^.56*y.^.44=1', [0 6 0 6]);

And then something like:

y=get(cd,'YData');

But all I get is values from 0 to 6, not the shown y-values in the figure! In essence I need all the (x,y)-pairs in the interval (0 excluded)

Thanks in advance Patrick

[kalpana]

I also want the x&y values of ezplot. how to get them? Please help us if you know.

Answer 1

[Friedrich]

Hi,

you need to get the contourMatrix:

bla = ezplot('1.5*x.^.56*y.^.44=1', [0 6 0 6]);
tmp = get(bla,'contourMatrix');
figure
plot(tmp(1,:),tmp(2,:))
set(gca,'ylim',[0 6])

Small note: Don't name a variable, e.g. "cd" like a MATLAB function.

[kalpana]

I don't know if i can comment on other's website. But, Thank you very much for your answer Friedrich.

Sorry Patrick for commenting on your web site.

[Patrick]

It's totally okay kalpana!

Thank you so much Friedrich, solved my problem perfectly. Thank you also for the advice. I'm new at Matlab, so didn't think cd could be a ML-function (change directory I guess?).

[Patrick]

By the way Friedrich, if you are still reading. If you don't mind me asking: how did you know this? I could not find the information in the 'help'-section myself, so I'm quite interrested in knowing where you got the information.

Thanks in advance, and again thank you for the answer itself.

[Friedrich]

Hi,

I ran

bla = ezplot('1.5*x.^.56*y.^.44=1', [0 6 0 6]);

And then did a get(bla) to see what are the properties and what is stored in them. Since there aren't much properties which contain any numerical data it didn't took long to figure out that the data is stored under the contourMatrix property.