I define a function f(x)=NIntegrate[...]. Then I define a function g(f(x)). Them I want to calculate another function h(g(f(x)))=NIntegrate[...].
So I have NIntegrate inside another NIntegrate. Also, I need to do this over a large range of values, so it takes a lot of time in the computer, and usually it can't compute (have non non-numerical values, etc) well.
is there a general strategy for doing this? I can't seem to find anything in the help. thanks!