Description Usage Arguments Value Author(s) References See Also Examples
This function currently implements piecewise linear interpolation (=barycentric interpolation).
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x 
vector of xcoordinates of data points or a

y 
vector of ycoordinates of data points. Missing values are not accepted. If left as NULL indicates that 
z 
vector of zvalues at data points or a character variable
naming the variable of interest in the
Missing values are not accepted.

xo 
If If 
yo 
If If 
input 
text, possible values are This is used to distinguish between regular and irregular gridded data. 
output 
text, possible values are If In the case of 
linear 
logical, only for backward compatibility with Please use the new 
method 
text, possible methods are (currently only, more is under
developement) This replaces the old 
extrap 
logical, indicates if extrapolation outside the convex hull is intended, will not work for piecewise linear interpolation! 
duplicate 
character string indicating how to handle duplicate data points. Possible values are

dupfun 
a function, applied to duplicate points if

nx 
dimension of output grid in x direction 
ny 
dimension of output grid in y direction 
deltri 
triangulation method used, this argument will later be moved
into a control set together with others related to the spline
interpolation! Possible values are 
a list with 3 components:
x,y 
If If 
z 
If If If the input was a 
Albrecht Gebhardt <albrecht.gebhardt@aau.at>, Roger Bivand <roger.bivand@nhh.no>
Moebius, A. F. (1827) Der barymetrische Calcul. Verlag v. Johann Ambrosius Barth, Leipzig, https://books.google.at/books?id=eFPluv_UqFEC&hl=de&pg=PR1#v=onepage&q&f=false
Franke, R., (1979). A critical comparison of some methods for interpolation of scattered data. Tech. Rep. NPS5379003, Dept. of Mathematics, Naval Postgraduate School, Monterey, Calif.
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