Description Usage Arguments Details Value Note References See Also Examples

Points inside polygon region.

1 |

`x, y` |
x-, y-coordinates of points to be tested for being inside the polygon region. |

`xp, yp` |
coordinates of the vertices specifying the polygon. |

`boundary` |
Logical; does the boundary belong to the interior. |

For a polygon defined by points `(xp, yp)`

, determine if the
points `(x, y)`

are inside or outside the polygon. The boundary
can be included or excluded (default) for the interior.

Logical vector, the same length as `x`

.

Special care taken for points on the boundary.

Hormann, K., and A. Agathos (2001). The Point in Polygon Problem for Arbitrary Polygons. Computational Geometry, Vol. 20, No. 3, pp. 131–144.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ```
xp <- c(0.5, 0.75, 0.75, 0.5, 0.5)
yp <- c(0.5, 0.5, 0.75, 0.75, 0.5)
x <- c(0.6, 0.75, 0.6, 0.5)
y <- c(0.5, 0.6, 0.75, 0.6)
inpolygon(x, y, xp, yp, boundary = FALSE) # FALSE
inpolygon(x, y, xp, yp, boundary = TRUE) # TRUE
## Not run:
pg <- matrix(c(0.15, 0.75, 0.25, 0.45, 0.70,
0.80, 0.35, 0.55, 0.20, 0.90), 5, 2)
plot(c(0, 1), c(0, 1), type="n")
polygon(pg[,1], pg[,2])
P <- matrix(runif(20000), 10000, 2)
R <- inpolygon(P[, 1], P[, 2], pg[, 1], pg[,2])
clrs <- ifelse(R, "red", "blue")
points(P[, 1], P[, 2], pch = ".", col = clrs)
## End(Not run)
``` |

pracma documentation built on May 21, 2017, 1:25 a.m.

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