R: Data interpolated to a grid objects.

griddata objects {wavethresh} | R Documentation

## Data interpolated to a grid objects.

### Description

These are objects of classes

`griddata`

These objects store the results of interpolating a 1-D regression data set to a grid which is a power of two in length

### Details

The help page for `makegrid` and Kovac, (1997), p.81 give further details about how a `griddata` object is constructed.

### Value

The following components must be included in a legitimate griddata object.

`gridt` | a vector containing the values of the grid on the "x" axis.
`gridy` | a vector containing the values of the grid on the "y" axis. This vector has to be the same length as gridt. Typically the values in (`gridt, gridy`) are the results of interpolating arbitrary data (`x,y`) onto (`gridt, gridy`).

`G`Codes the value of the linear interpolant matrix for the corresponding entry in `gridt`. The value at each point corresponds to the proportion of the original data point pointed to by `Gindex` that contributes to the new value at the corresponding `gridt` value. See Kovac, (1997), page 81 for further information.

`Gindex` | Each entry in `Gindex` refers to one of the pairs in (`x,y`) which is contributing to the (`gridt, gridy`) interpolant. See previous help for `G`.

### GENERATION

This class of objects is returned from the `makegrid` function to represent the results of interpolating a 1-D regression data set to a grid.

### METHODS

The `griddata` class of objects really on has one function that uses it: `irregwd`.

### RELEASE

Version 3.9.6 Copyright Arne Kovac 1997 Copyright Guy Nason (help pages) 1999.

### SEE ALSO

`makegrid`, `irregwd`

### Author(s)

Arne Kovac

[Package wavethresh version 4.6.8 Index]