# resample: Resample an array In mmand: Mathematical Morphology in Any Number of Dimensions

## Description

The resample function uses a kernel function to resample a target array. This can be thought of as a generalisation of array indexing which allows fractional indices. It is (S3) generic. The rescale function is an alternative interface for the common case where the image is being scaled to a new size.

## Usage

 1 2 3 4 5 6 7 resample(x, points, kernel, ...) ## Default S3 method: resample(x, points, kernel, pointType = c("auto", "general", "grid"), ...) rescale(x, factor, kernel, ...)

## Arguments

 x Any object. For the default method, this must be coercible to an array. points Either a matrix giving the points to sample at, one per row, or a list giving the locations on each axis, which will be made into a grid. kernel A kernel function object, used to provide coefficients for each resampled value, or the name of one. ... Additional options, such as kernel parameters. pointType A string giving the type of the point specification being used. Usually can be left as "auto". factor A vector of scale factors, which will be recycled to the dimensionality of x.

## Value

If a generalised sampling scheme is used (i.e. with points a matrix), the result is a vector of sampled values. For a grid scheme (i.e. with points a list, including for rescale), it is a resampled array.

## Author(s)

Jon Clayden <[email protected]>

kernels for kernel-generating functions.

## Examples

 1 resample(c(0,0,1,0,0), seq(0.75,5.25,0.5), triangleKernel())

### Example output

[1] 0.00 0.00 0.00 0.25 0.75 0.75 0.25 0.00 0.00 0.00

mmand documentation built on May 2, 2019, 6:53 a.m.