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 LeischSee 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)