Interpolate Values of Array

Usage

interpolate(x, a, adims=lapply(dimnames(a), as.numeric),
            method="linear")

Arguments

x Matrix of values at which interpolation shall take place.
a Array of arbitrary dimension.
adims List of the same structure as dimnames(a).
method Interpolation method, one of "linear" or {"constant"}.

Description

For each row in matrix x, the hypercube of a containing this point is searched. The corners of the hypercube are linearly interpolated. By default, dimnames(a) is taken to contain the coordinate values for each point in a. This can be overridden using adims. If method=="constant", the value of the ``lower left'' corner of the hypercube is returned.

Author(s)

Friedrich Leisch

See Also

approx, spline

Examples

x <- seq(0,3,0.2)
z <- outer(x,x, function(x,y) sin(x*y))
dimnames(z) <- list(x,x)
sin(1.1*2.1)
interpolate(c(1.1, 2.1),z)

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