# formula.fv

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##### Extract or Change the Plot Formula for a Function Value Table

Extract or change the default plotting formula for an object of class "fv" (function value table).

Keywords
methods, spatial
##### Usage
## S3 method for class 'fv':
formula(x, \dots)formula(x, ...) <- value## S3 method for class 'fv':
formula(x, \dots) <- value
##### Arguments
x
An object of class "fv", containing the values of several estimates of a function.
...
Arguments passed to other methods.
value
New value of the formula. Either a formula or a character string.
##### Details

A function value table (object of class "fv", see fv.object) is a convenient way of storing and plotting several different estimates of the same function.

The default behaviour of plot(x) for a function value table x is determined by a formula associated with x called its plot formula. See plot.fv for explanation about these formulae.

The function formula.fv is a method for the generic command formula. It extracts the plot formula associated with the object.

The function formula<- is generic. It changes the formula associated with an object.

The function formula<-.fv is the method for formula<- for the class "fv". It changes the plot formula associated with the object.

##### Value

• The result of formula.fv is a character string containing the plot formula. The result of formula<-.fv is a new object of class "fv".

fv, plot.fv, formula.

• formula.fv
• formula<-
• formula<-.fv
##### Examples
K <- Kest(cells)
formula(K)
formula(K) <- (iso ~ r)
Documentation reproduced from package spatstat, version 1.34-1, License: GPL (>= 2)

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