Franke's function has two Gaussian peaks of different heights, and a smaller dip. It is used as a test function in interpolation problems.
Input Domain:The function is evaluated on the square xi ∈ [0, 1], for all i = 1, 2.
Franke, R. (1979). A critical comparison of some methods for interpolation of scattered data (No. NPS53-79-003). NAVAL POSTGRADUATE SCHOOL MONTEREY CA.
Haaland, B., & Qian, P. Z. (2011). Accurate emulators for large-scale computer experiments. The Annals of Statistics, 39(6), 2974-3002.
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