how to get probability data (y values) from probplot?

Hello dear.

I want to manage and work on probability data produced by a probplot function.

I have my dataset (data) which is a vector of something like thermal index.

I apply the probplot Matlab command with an exponentialpr distribution, and I would like to find the intercept points between the exponential function (black dashed line) and my data, in terms of y-values so the probability.

figure,probplot('exponential',data)

I know that the equation of the black dashed shold be

y=f(x|mu)=1/mu*exp^(-x/mu)

where mu (μ) is the mean of the function and could be calculted as

pd=fitdist(data,'exponential');
mu=pd.mu;

Now, I have to find a certain threshold for a probability value which corresponds to the first intercept of the black dashed line with my probability exponential distribution, but at the moment I don't know how to act on the Y_data from probplot function.

Any helps?

Thank you!

[Adam]

h = probplot(...)

will return a vector of handles to the line objects plotted. You can get the YData from these. Ideally you would use whatever maths produced the plot to get your data rather than hack it out of a plot, but if the maths is not obvious then this method should at least give you the data.

[fransec]

I am not able to have access on the properties and object of the graphic array.

Could you explain with a mroe detail, please? Thank you.

[fransec]

I got in the h = probplot('exponential',data) which is a graphic primitive data of matlab

h = 

  2x1 graphics array:

  Line            (data)
  FunctionLine

and I extracted the value of x and y from probplot, both for my dataset (Line) and for the black line of the function (FunctionLine).

xdata=h(1,1).XData;
ydata=h(1,1).YData;
xfunction=h(2,1).XData;
yfunction=h(2,1).YData;

The problem is that for the y data( ydata and yfunction), the values have completely a different range and they don't go from 0 to 1 as expressed in the probplot graph. It seems that they have been converted to be plotted in the range between 0 and 1 as the probabilty, but really they don't have those values (for example max of ydata is 7.9)...