Plotting Gamma Distribution, please help?

These are my code, however, i am not getting the plot.

X=1:100; % Duration of data

Data=rand(1,100); % randomly generated 100 years of data

Z=gamfit(Data); % fitting distribution for shape and scale factor

beta=2; % Shape factor

alpha=3; % scale factor

pdf=gampdf(X,alpha,beta); % pdf of the gamma distribution

Plot(pdf,X,'-');

Answer 1

[Youssef Khmou]

It is correct, you just need to exchange pdf with X :

        plot(x,pdf);

[Hydro]

still giving me the error that:

Index exceeded matrix dimension for this line.

pdf=gampdf(X,alpha,beta);

[Youssef Khmou]

the variables alpha and beta are in the system , change theirs names to Alpha, Beta for example.

Answer 2

[Mohammed]

Change capital P-letter to small P-letter, MATLAB is case senstive!

plot(pdf,X,'-');

Answer 3

[Hydro]

here is my plot which i dont think is a gamma distribution plot. my alpha is 3 and my beta is 409.

Answer 4

[Hydro]

[Youssef Khmou]

X=1:100; ALPHA=3; BETA=2; PDF=gampdf(X,ALPHA,BETA); plot(X,PDF);

[Hydro]

Thanks Youssef, please have a look at my excel sheet which i am using for this problem...see if you are getting the same as i got up there...sorry for asking too much however, i really need to get this done as i am going to present it soon.

my x is years while alpha and beta were generated from the flow data.

Thanks dear

Answer 5

[Benabed Rabia]

When i use plot command the graph just links the dots it does not give a curve, please help me! Thanks in advence