Extract Subset of Pixel Image on Linear Network

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Description

Extract a subset of a pixel image on a linear network.

Usage

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  ## S3 method for class 'linim'
x[i, ...]

Arguments

x

A pixel image on a linear network (object of class "linim").

i

Spatial window defining the subregion. Either a spatial window (an object of class "owin"), or a logical-valued pixel image, or a point pattern (an object of class "ppp"), or any type of index that applies to a matrix, or something that can be converted to a point pattern by as.ppp (using the window of x).

...

Ignored.

Details

This function is a method for the subset operator "[" for pixel images on linear networks (objects of class "linim").

The pixel image x will be restricted to the domain specified by i.

If i is a window (or a logical-valued pixel image) then x[i] is another pixel image of class "linim", representing the restriction of x to the spatial domain specified by i.

If i is a point pattern, then x[i] is the vector of pixel values of x at the locations specified by i. Pixels outside the domain of x have value NA.

Value

Another pixel image on a linear network (object of class "linim") or a vector of pixel values.

Author(s)

\adrian

Examples

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  M <- as.mask.psp(as.psp(simplenet))
  Z <- as.im(function(x,y){x}, W=M)
  Y <- linim(simplenet, Z)
  X <- runiflpp(4, simplenet)
  Y[X]
  Y[square(c(0.3, 0.6))]

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