How to run KS test with Dagum distribution

I have generated x numbers with Dagum distribution using inverse cdf method and now I want to run ks test but I constantly get this error:

Error using kstest (line 142)
CDF must define an increasing function of X.
This is my code:

N=20000;
a=5;
p=1;
b=1;
u=rand(1,N);
x=b*(u.^(-1/p)-1).^(-1/a);

cdf=(1+(x/b).^(-a)).^(-p);
X=0:length(x)-1;
h=kstest(x,[X' cdf']);
How should I run ks test with Dagum distribution'

Thank you!

Answer 1

[Image Analyst]

I think your x is wrong. How did you come up with that x????

[Lolipop]

by inverse cdf method....it could be that my cdf is wrong but how should I generate x then?

[Image Analyst]

I'd try using

x = linspace(minX, maxX, numberOfElements);

But I don't know that distribution so I don't know what values the equation should typically use.