How can I define a set of random distributions as I can use this type in the following functions parameter

I'm trying to define a set of 'random distribution type' as I can use any of them in the parameter of the a funtion I use.

I tried this for example :

x= struct("poisson", exprnd(Mean, size ), "Gamma", gamma(Mean, size))

now i can write

x.poisson to get the random numbers

but if I want to use another variable i.e:

b=poisson
x.b

the last line makes error and dont give me the value of x.poisson

is there a better idea to map a variable with a set of values?

Thank you!

Answer 1

[Walter Roberson]

b = "poisson";
x.(b)

[Nazer Hdaifeh]

Really Thanks :)