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The limit-state function is defined by: $$ b1 = 3 + (u_1-u_2)^2/10 - sign(u_1 + u_2)*(u_1+u_2)/sqrt(2) $$ $$ b2 = sign(u_2-u_1)*(u_1-u_2)+7/sqrt(2) $$ $$ f(u) = min(b1, b2) $$
waarts
The function can handle a vector or matrix with column vectors.
Waarts, PH: An appraisal of DARS: directional adaptive response surface sampling Delft University Press, The Netherlands, 2000.