Why four parameters stick together for PDF and CDF?

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% PDF analysis
pd = makedist('Weibull','a',5,'b',2);
overland_pdf.png
z1 = pdf(pd,CS);
z2 = pdf(pd,SCS);
z3 = pdf(pd,VSCS);
z4 = pdf(pd,ESCS);
figure;
hold on;
plot(CS,z1,'g');
set(gca,'fontsize',16)
ylabel('PDF')
xlabel('Rain rate (mm/h)')
plot(SCS,z2,'k');
plot(VSCS,z3,'b');
plot(ESCS,z4,'r');
legend('CS','SCS','VSCS','ESCS')
% CDF analysis
pd1 = makedist('Weibull','a',5,'b',2);
a2 = cdf(pd1,CS);
a3 = cdf(pd1,SCS);
a4 = cdf(pd1,VSCS);
a5 = cdf(pd1,ESCS);
figure;
hold on;
plot(CS,a2,'g');
set(gca,'fontsize',16)
ylabel('CDF')
xlabel('Rain rate (mm/h)')
plot(SCS,a3,'k');
plot(VSCS,a4,'b');
plot(ESCS,a5,'r');
legend('CS','SCS','VSCS','ESCS')

Accepted Answer

KALYAN ACHARJYA
KALYAN ACHARJYA on 25 Nov 2018
May be PDF and CDF are same in that case
  2 Comments
MD JALAL UDDIN
MD JALAL UDDIN on 25 Nov 2018
Even I tried for different dataset; however, all parameters stick together. Is there problem in the code?
KALYAN ACHARJYA
KALYAN ACHARJYA on 25 Nov 2018
Edited: KALYAN ACHARJYA on 25 Nov 2018
There may be possiblity in number of cases PDF and CDF are same. If the PDF becomes zero in respective event.
Why donot you consider simple event occurance as a example and check the code?
Cumulative is the total probability of all below PDF

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