SPOT (version 2.11.10)

funPowellBs: funPowellBs (No. 9, More No. 3)

Description

2-dim Powell Badly Scaled Test Function

Usage

funPowellBs(x)

Arguments

x

matrix of points to evaluate with the function. Rows for points and columns for dimension.

Value

1-column matrix with resulting function values

References

More, J. J., Garbow, B. S., and Hillstrom, K. E. (1981). Testing unconstrained optimization software. ACM Transactions on Mathematical Software (TOMS), 7(1), 17-41. 10.1145/355934.355936

Powell, M.J.D. (1970). A hybrid method for nonlinear equations. In Numerical methods for Nonlinear Algebraic Equations, P. Rabinowitz (Ed), Gordon & Breach, New York., 3(3), 87-114.

Examples

# NOT RUN {
x1 <- matrix(c(-1,1),1,)
funPowellBs(x1)

# Running SPOT with 20 function evaluations with default configurations
res <- spot(,fun=funPowellBs,c(-10,-10),c(10,10),control=list(funEvals=20))
plotModel(res$model, points = rbind(c(res$xbest[1], res$xbest[2]),c(1.098e-5,9.106)))

# }