compute a numerical double integral

I have this function beta defined as follows: fun1=@(x) -exp((-c.*x.*b+a.*exp(-b.*x)-a)./b); beta=@(x) (exp(-(-c.*x*b+a.*exp(-b.*x)-a)./b).*integral(fun1,0,x,'AbsTol',1.e-12)); where a,b,c are constants. I would like to define the function alpha as: alpha=@(t) integral(beta(x),0,t) in other words, alpha(t) should be the integral of the function beta over the interval [0,t]. The problem is that yet beta has been defined as an integral and the code obviously doesn't work.

[Torsten]

Anything wrong with the solution under

https://de.mathworks.com/matlabcentral/answers/334870-i-have-a-function-beta-defined-as-an-integral-i-want-to-define-another-function-alpha-being-the-in

?

Best wishes

Torsten.