How can I make my CDF plots start at the origin of the graph?

I am using CDF plots of two data sets compared to one another. I'd like them to start at the same place (zero), to compare their distributions.

Here's what I'm using:

F1 = cdfplot(x);
hold on
F2 = cdfplot(y)
set(F1,'LineWidth',2,'Color','r')
set(F2,'LineWidth',2)
legend([F1 F2],'Data Set 1','Data Set 2','Location','NW')

This is an example of the result: http://i.imgur.com/ctDON.png

Thanks!

Answer 1

[Walter Roberson]

The sample plot is consistent with the possibility that both start at 0, but that one of them is 0 for more entries than the other. e.g.,

0 0 0 0 0 0 x x x x 
0 0 0 y y y y y y y

The first of those lines would have a count of 0 until the 7th element and so would not start to rise until then, whereas the second line would start to rise at the 4th element. But both of them start at 0.