jarea function

Area of closed polygon.

Area of closed polygon.

Returns area of polygon.

jarea(L)

Arguments

  • L: list with x,y components

Details

If polygon is counter clockwise (CCW) area will be positive, else negative. If not sure, take absolute value of output.

Returns

Area in dimensions of x,y

Author(s)

Jonathan M. Leesjonathan.lees@unc.edu

Examples

set.seed(12) X = runif(10, 1, 100) Y = runif(10, 1, 100) hc = chull(X, Y) #### looks like chull returns points in clockwise L = list(x=X[hc] , y=Y[hc] ) j1 = jarea(L ) ######### reverse order of polygon jc = rev(hc) L = list(x=X[jc] , y=Y[jc] ) j2 = jarea(L )
  • Maintainer: Jonathan M. Lees
  • License: GPL (>= 2)
  • Last published: 2024-07-09

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