CDF plot is not starting from zero in y axis and does not rest on 1.

I am calculating the energy efficiency (EE) of a wireless network and my values are very simillar as shown in code below. I want to plot the CDF curve for EE and make the following code.

w=[0 102.0100 103.560 105.3177 104.9670 104.9497 105.0100 105.1079 105.2866 104.9930 105.2124 105.1465 105.1701 105.0588 105.2687]

[F,X,Flo,Fup] = ecdf(w);

plot(X,F);

hold on;

curve :

The plot obtained by executing the code is not starting from zero in y axis and most of the values are lying between 104 to 106 and it is also not visible by this curve. I want the plot simillar to the curve attached. If any body have any idea please help me. Thanks you.

[Akira Agata]

Since minimum value of your data w is 0, CDF starts from (0,0). Please try plot(X,F,'o-') instead.

Regarding your 2nd question, I believe you need to remove 0 from you data because the x-axis of your attached CDF figure is log scale.

[Shweta Rajoria]

Thank you Akira, first part is clear to me. even if i am removing zero i am getting a straight vertical line around 105 but it should horizontal after reaching one around 105. And on removing zero, graph is not starting with zero as in figure 2. How could i get the graph similar to figure 2.

[Christopher Creutzig]

Your data simply has a different shape than that example.

That said, the sample plot you listed uses logarithmic scaling on the x axis. Also, ecdf does not know where the range of observable values starts and places the 0 at the lowest value it sees. To get the 0 starting value further to the left, reassign its x coordinate:

w=[102.0100 103.560 105.3177  104.9670  104.9497  105.0100  105.1079  105.2866  104.9930  105.2124  105.1465  105.1701  105.0588  105.2687];
[F,X] = ecdf(w);
X(1) = 100;
plot(X,F);
set(gca,'XScale','log')