Could somebody share some tips on implementing multivariate integration and partial differentiation in R? 
For example, for a trivariate joint distribution (cumulative density function) of F(x,y,z), how to differentiate with respect to x and get the bivariate distribution (probability density function) of f(y,z). Or integrate f(x,y,z) with respect to x to get bivariate distribution of (y,z).

Your sharing is appreciated.

Wei-han Liu


      
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