The limit-state function is defined in the standard space and isoprobabilistic transformation is used internally.
Parameters mean_Fs and p can be specified and default are 27.5 and 3 respectively.
twodofThe function can handle a vector or a matrix with column vectors.
Dubourg, V and Deheeger, F and Sudret, B:
Metamodel-based importance sampling for the simulation of rare events
arXiv preprint arXiv:1104.3476, 2011.