MATLAB: How to obtain the cumulative frequencies using the CDFPLOT function from the Statistics Toolbox

Question

I want to obtain the values from the plot of the cumulative distribution that I created with CDFPLOT.

Answer 1

You can obtain the frequency data from CDFPLOT by using the handle for the line to access its YData values. If you use the command:

h = cdfplot(x);

the variable 'h' will contain the handle for the line. You can then use the GET command to obtain the YData from the line that will contain the cumulative frequencies:

y = get(h,'YData');

This will contain the y values used to create the plot. However, since the plot consists of alternating horizontal and vertical segments, the data will contain repeated values from the horizontal segments of the line. You can use the UNIQUE function to obtain the unique frequency values:

y = unique(y);