interpolant {chebpol}R Documentation

Evaluate an interpolant in a point

Description

An interpolant is a function returned by ipol which has prespecified values in some points, and which fills in between with some reasonable values.

Arguments

x

The argument of the function. A function of more then one variable takes a vector. x can also be a matrix of column vectors.

threads

The number of threads to use for evaluation. All interpolants created by chebpol are parallelized. If given a matrix argument x, the vectors can be evaluated in parallel.

...

Other parameters. Currently used for simplex linear interpolants with the logical argument epol which makes the interpolant extrapolate to points outside the domain. The stalker spline has the argument blend=c("linear","cubic","sigmoid") where a blending function can be chosen as described in a vignette. The "multilinear" interpolant also has such a blending function.

Value

A numeric. If more than one point was evaluated, a vector.

Examples

grid <- list(x=seq(0,1,length.out=10), y=seq(0,1,length.out=10))
val <- runif(100)
dim(val) <- c(10,10)
ip <- ipol(val, grid=grid, method='fh')
ip(c(0.3, 0.8))
ip(matrix(runif(12),2), threads=2)
[Package chebpol version 2.1-2 Index]