spatstat (version 1.31-3)

Extract.fv: Extract Subset of Function Values

Description

Extract a subset of an object of class "fv".

Usage

## S3 method for class 'fv':
[(x, i, j, \dots, drop=FALSE)

Arguments

x

a function value object, of class "fv" (see fv.object). Essentially a data frame.

i

any appropriate subset index. Selects a subset of the rows of the data frame, i.e. a subset of the domain of the function(s) represented by x.

j

any appropriate subset index for the columns of the data frame. Selects some of the functions present in x.

...

Ignored.

drop

Logical. If TRUE, the result is a data frame or vector containing the selected rows and columns of data. If FALSE (the default), the result is another object of class "fv".

Value

• If drop=FALSE, a function value object (of class "fv"). If drop=TRUE, a data frame or vector.

Details

This is a method for "[" for the class "fv". It is very similar to [.data.frame except for a few extra checks on the sanity of the result.

See Also

fv.object

Examples

K <- Kest(cells)

 # discard the estimates of K(r) for r  > 0.1
 Ksub <- K[K$r <= 0.1, ]

 # discard the border method estimator
 Ksub <- K[ , names(K) != "border"]

 # read some values
 K[5, ,drop=TRUE]