akima760 {akima} R Documentation

## 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)


[Package akima version 0.6-3.4 Index]