Popular 2-dimensional single-objective test function based on the formula:
makeBraninFunction()
[smoof_single_objective_function
]
F. H. Branin. Widely convergent method for finding multiple solutions of simultaneous nonlinear equations. IBM J. Res. Dev. 16, 504-522, 1972.
library(ggplot2)
fn = makeBraninFunction()
print(fn)
print(autoplot(fn, show.optimum = TRUE))
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