nestsplit

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Nested Split

Applies two splitting operations to a point pattern, producing a list of lists of patterns.

Keywords
manip, spatial
Usage
nestsplit(X, ...)
Arguments
X
Point pattern to be split. Object of class "ppp".
...
Data determining the splitting factors or splitting regions. See Details.
Details

This function splits the point pattern X into several sub-patterns using split.ppp, then splits each of the sub-patterns into sub-sub-patterns using split.ppp again. The result is a hyperframe containing the sub-sub-patterns and two factors indicating the grouping.

The arguments ... determine the two splitting factors or splitting regions. Each argument may be:

• a factor (of length equal to the number of points inX)
• the name of a column of marks ofX(provided this column contains factor values)
• a tessellation (class"tess")
• a pixel image (class"im") with factor values
• a window (class"owin")
• identified by name (in the formname=value) as one of the formal arguments ofquadratsortess
The arguments will be processed to yield a list of two splitting factors/tessellations. The splits will be applied to X consecutively to produce the sub-sub-patterns.

Value

• A hyperframe with three columns. The first column contains the sub-sub-patterns. The second and third columns are factors which identify the grouping according to the two splitting factors.

split.ppp, quantess

• nestsplit
Examples
# factor and tessellation
Nft <- nestsplit(amacrine, marks(amacrine), quadrats(amacrine, 3, 1))
Ntf <- nestsplit(amacrine, quadrats(amacrine, 3, 1), marks(amacrine))
Ntf

# two factors
big <- with(marks(betacells), area > 300)
Nff <- nestsplit(betacells, "type", factor(big))

# two tessellations
Tx <- quantess(redwood, "x", 4)
Td <- dirichlet(runifpoint(5, Window(redwood)))
Ntt <- nestsplit(redwood, Td, Tx)
Ntt2 <- nestsplit(redwood, Td, ny=3)
Documentation reproduced from package spatstat, version 1.41-1, License: GPL (>= 2)

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