R: Creates image for a 2-d histogram from irregular locations

image.count {fields}

R Documentation

Creates image for a 2-d histogram from irregular locations

Description

Discretizes a matrix of 2-d locations and counts the number of occurrences for each grid box.

Usage

image.count(x, grid=NULL, nrow=64, ncol=64,...)

Arguments

`x`
`grid`	A list with components x and y of equally spaced values describing the centers of the grid points. The default is to use nrow and ncol and the ranges of the data locations (x) to construct a grid.
`nrow`	Number of rows for the image. Note that nrows equals the number of x values and corresponds to the horizontal dimension.
`ncol`	Number of columns for the image. Note that ncol= number of y values and will be the vertical dimension.
`...`	Other possible arguments (not used)

Value

An list in image format. Components x and y are the grid values , z is a nrow X ncol matrix with the Z values. NA's are placed at cell locations where Z data has not been supplied.

Examples

look<- image.count( RMprecip$x, nrow=32, ncol=32)
image.plot( look)