R: General input function

userinput {RandomFields}

R Documentation

General input function

Description

The function provides a general functionality to read and reply user input by locator and readline

Usage

userinput(fct, info=NULL, prompt, n,  type="n", pch=par()$pch,
          cex=par()$cex, ...)

Arguments

`fct`	either ‘locator’ or ‘readline’
`info`	arbitrary object; tracing information that is useful in case the user likes to edit the stored sequence of inputs
`prompt`	prompt parameter of `readline`
`n`	parameter `n` of `locator`
`type`	parameter `type` of `locator`
`pch`	character type used by `locator`
`cex`	character size used by `locator`
`...`	additional graphics parameters used by `locator`

Details

The behaviour of userinput depends on the the value of action set by useraction, see there for more information.

Value

If fct="readline" then a character vector of length one is returned.
If fct="locator" then the function returns a list containing 'x' and 'y' components which are the coordinates of the identified points in the user coordinate system, i.e., the one specified by 'par("usr")'.

Author(s)

Martin Schlather, martin.schlather@math.uni-goettingen.de http://www.stochastik.math.uni-goettingen.de/institute