# plot.fv

##### Plot Function Valuesn

Plot method for the class `"fv"`

.

- Keywords
- spatial

##### Usage

```
plot.fv(x, fmla, subset=NULL, lty=NULL, col=NULL, lwd=NULL,
xlim, ylim, xlab, ylab, ...)
```

##### Arguments

- x
- An object of class
`"fv"`

, containing the variables to be plotted or variables from which the plotting coordinates can be computed. - fmla
- an R language formula determining which variables or expressions are plotted. Either a formula object, or a string that can be parsed as a formula.
- subset
- (optional) subset of rows of the data frame that will be plotted.
- lty
- (optional) numeric vector of values of the graphical parameter
`lty`

controlling the line style of each plot. - col
- (optional) numeric vector of values of the graphical parameter
`col`

controlling the colour of each plot. - lwd
- (optional) numeric vector of values of the graphical parameter
`lwd`

controlling the line width of each plot. - xlim
- (optional) range of x axis
- ylim
- (optional) range of y axis
- xlab
- (optional) label for x axis
- ylab
- (optional) label for y axis
- ...
- Extra arguments passed to
`plot.default`

.

##### Details

This is the `plot`

method for the class `"fv"`

.

The use of the argument `fmla`

is like `plot.formula`

, but offers
some extra functionality.
The left and right hand sides of `fmla`

are evaluated in the data frame `x`

,
and the results are plotted against each other
(the left side on the $y$ axis
against the right side on the $x$ axis).
Both left and right sides may be variables in the data frame
or expressions in these variables.

Multiple curves may be specified by a single formula
of the form
`cbind(y1,y2,...,yn) ~ x`

, where `x,y1,y2,...,yn`

are
expressions involving the variables in the data frame.
Each of the variables `y1,y2,...,yn`

in turn will be plotted
against `x`

.
See the examples.

The symbol `.`

can be used in `fmla`

to represent all
the function values. See the examples.

##### Value

- none. Side effect is a plot.

##### See Also

##### Examples

```
data(cells)
K <- Kest(cells)
# K is an object of class "fv"
plot(K, iso ~ r) # plots iso against r
plot(K, sqrt(iso/pi) ~ r) # plots sqrt(iso/r) against r
plot(K, cbind(iso,theo) ~ r) # plots iso against r AND theo against r
plot(K, . ~ r) # plots all available estimates of K against r
plot(K, sqrt(./pi) ~ r) # plots all estimates of L-function
# L(r) = sqrt(K(r)/pi)
plot(K, cbind(iso,theo) ~ r, col=c(2,3))
# plots iso against r in colour 2
# and theo against r in colour 3
plot(K, iso ~ r, subset=quote(r < 0.2))
# plots iso against r for r < 10
```

*Documentation reproduced from package spatstat, version 1.6-9, License: GPL version 2 or newer*