[Rd] How to create a function calling two functions with unknown number of parameters?

... can be used to represent unknown number of parameters passed into a function. For example, I write a function g. g calls another function f1. For example f1 could be different random number generation function. when f1=rnorm(), it has 3 parameters n, mean and standard deviation. when f

[Rd] Computational singularity of a positive definite matrix

I'm trying to use function "solve" to find the inverse of a matrix, which is positive definite in theory. But for some situations, I get error message because of computational singularity. I'm wondering if I can set the tolerance for detecting linear independence to an infinitely small value to av