whichhalfplane

0th

Percentile

Test Which Side of Infinite Line a Point Falls On

Given an infinite line and a spatial point location, determine which side of the line the point falls on.

Keywords
manip, spatial
Usage
whichhalfplane(L, x, y = NULL)
Arguments
L

Object of class "infline" specifying one or more infinite straight lines in two dimensions.

x,y

Arguments acceptable to xy.coords specifying the locations of the points.

Details

An infinite line \(L\) divides the two-dimensional plane into two half-planes. This function returns a matrix M of logical values in which M[i,j] = TRUE if the jth spatial point lies below or to the left of the ith line.

Value

A logical matrix.

See Also

infline

Aliases
  • whichhalfplane
Examples
# NOT RUN {
  L <- infline(p=runif(3), theta=runif(3, max=2*pi))
  X <- runifpoint(4)
  whichhalfplane(L, X)
# }
Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)

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