spatstat (version 1.4-5)

subset.fasp: Extract Subset of Function Array

Description

Extract a subset of a function array (an object of class "fasp").

Usage

subset.fasp(X, I, J, drop,...)
  subset.fasp(X, I, J)
  X[I]
  X[I, J]

Arguments

X

A function array. An object of class "fasp".

I

any valid expression for a subset of the row indices of the array.

J

any valid expression for a subset of the column indices of the array.

drop

Ignored - this argument is required for consistency with other methods for subset.

...

Ignored - this argument is required for consistency with other methods for subset.

Value

• A function array (of class "fasp").

synopsis

subset.fasp(x, I, J, drop,...)

Details

A function array can be regarded as a matrix whose entries are functions. See fasp.object for an explanation of function arrays.

This routine extracts a sub-array according to the usual conventions for matrix indexing.

See Also

fasp.object

Examples

library(spatstat)

 # Lansing woods data - multitype points with 6 types
 data(lansing)
 # compute 6 x 6 array of all cross-type K functions
   a <- alltypes(lansing, "K")
   plot(a)
 <testonly># smaller dataset
   sub <- lansing[ seq(1,lansing$n,by=30), ]
   a <- alltypes(sub, "K")</testonly>
 # first three marks only
 b <- a[1:3,1:3]
 plot(b)
 # subset pertaining to hickories
 h <- a[levels(lansing$marks) == "hickory", ]
 plot(h)