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Hello, I have a x,y,z file.Z is not corresponding to a simple analytical function of x and y (see below). I am trying to find the minimum location of this surface and the z value corresponding to this location by a spline interpolation or from a polynomial fit. I tried with the akima package but as the location of the point I am looking for (the minimum) is outside of the convex hull it's

Hello everybody, I am trying different ways of interpolating a surface. Now, I am trying to interpolate these values using the MBA package. In order to do it I am using the surface option of the package. mba.surf(xyz, 20, 20, n = 1, m = 1, h = 8, extend=FALSE, sp=FALSE, ...) The function is giving me some results but not reliable at all. Maybe it's due to the n,m and h values which are