# akima760: Sample data from Akima's Bicubic Spline Interpolation code... In akima: Interpolation of Irregularly and Regularly Spaced Data

## Description

akima760 is a list with vector components x, y and a matrix z which represents a smooth surface of z values at the points of a regular grid spanned by the vectors x and y.

## References

Hiroshi Akima, "

", ACM Transactions on Mathematical Software, Vol. 22, No. 3, September 1996, pp. 357-361.

## Examples

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ## Not run: library(rgl) data(akima) # data rgl.spheres(akima760\$x,akima760\$z , akima760\$y,0.5,color="red") rgl.bbox() # bivariate linear interpolation # interp: akima.li <- interp(akima\$x, akima\$y, akima\$z, xo=seq(min(akima\$x), max(akima\$x), length = 100), yo=seq(min(akima\$y), max(akima\$y), length = 100)) # interp surface: rgl.surface(akima.li\$x,akima.li\$y,akima.li\$z,color="green",alpha=c(0.5)) # interpp: akima.p <- interpp(akima\$x, akima\$y, akima\$z, runif(200,min(akima\$x),max(akima\$x)), runif(200,min(akima\$y),max(akima\$y))) # interpp points: rgl.points(akima.p\$x,akima.p\$z , akima.p\$y,size=4,color="yellow") # bivariate spline interpolation # data rgl.spheres(akima\$x,akima\$z , akima\$y,0.5,color="red") rgl.bbox() # bivariate cubic spline interpolation # interp: akima.si <- interp(akima\$x, akima\$y, akima\$z, xo=seq(min(akima\$x), max(akima\$x), length = 100), yo=seq(min(akima\$y), max(akima\$y), length = 100), linear = FALSE, extrap = TRUE) # interp surface: rgl.surface(akima.si\$x,akima.si\$y,akima.si\$z,color="green",alpha=c(0.5)) # interpp: akima.sp <- interpp(akima\$x, akima\$y, akima\$z, runif(200,min(akima\$x),max(akima\$x)), runif(200,min(akima\$y),max(akima\$y)), linear = FALSE, extrap = TRUE) # interpp points: rgl.points(akima.sp\$x,akima.sp\$z , akima.sp\$y,size=4,color="yellow") ## End(Not run)

akima documentation built on May 2, 2019, 5:54 a.m.