# 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.

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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