R: Histogram of Values of a Spatial Function

hist.funxy {spatstat} | R Documentation

## Histogram of Values of a Spatial Function

### Description

Computes and displays a histogram of the values of a spatial function of class `"funxy"`.

### Usage

      ## S3 method for class 'funxy'
    hist(x, ..., xname)

### Arguments

`x` | A pixel image (object of class `"funxy"`).
`...` | Arguments passed to `as.im` or `hist.im`.
`xname` | Optional. Character string to be used as the name of the dataset `x`.

### Details

This function computes and (by default) displays a histogram of the values of the function `x`.

An object of class `"funxy"` describes a function of spatial location. It is a `function(x,y,..)` in the R language, with additional attributes.

The function `hist.funxy` is a method for the generic function `hist` for the class `"funxy"`.

The function is first converted to a pixel image using `as.im`, then `hist.im` is called to produce the histogram.

Any arguments in `...` are passed to `as.im` to determine the pixel resolution, or to `hist.im` to determine the histogram breaks and to control or suppress plotting. Useful arguments include `W` for the spatial domain, `eps,dimyx` for pixel resolution, `main` for the main title.

### Value

An object of class `"histogram"` as returned by `hist.default`. This object can be plotted.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.

### See Also

`spatialcdf` for the cumulative distribution function of an image or function.

`hist`, `hist.default`.

For other statistical graphics such as Q-Q plots, use `as.im(X)[]` to extract the pixel values of image `X`, and apply the usual statistical graphics commands.

### Examples

      f <- funxy(function(x,y) {x^2}, unit.square())
      hist(f)

[Package spatstat version 1.63-3 Index]