R: Interpolate Values of Array

interpolate {e1071} | R Documentation

## Interpolate Values of Array

### 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.

### 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"`.

### 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)

[Package e1071 version 1.7-4 Index]