akima (version 0.5-12)

akima760: Sample data from Akima's Bicubic Spline Interpolation code (TOMS 760)

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

## 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)