Hi everyone, Let's suppose that there is a function, R(x), with variable x, and R(x)= ? P(x,t) dt. P(x,t) is a function of x and t, but it is a very complicated integral, so no analytic solution is available. Another function is H(x, y)= h(y)* ? R(x)*f(x) dx. Here, f(x) and h(y) are functions of x and y respectively. R(x) is calculated before. I need to plot the relation between H(x, y) and y. The bounds of both integrals are known. Does anyone know how to do it numerically in Mathematica? I hope that I make my question clear enough. Thanks for any help that you can provide!! Cheers, Stven