polyarea | R Documentation |

Determines area of a polygon by triangle method. The variables
`x`

and `y`

define the vertex pairs, and must therefore
have the same shape. They can be either vectors or arrays. If
they are arrays then the columns of `x`

and `y`

are
treated separately and an area returned for each.

```
polyarea(x, y, d = 1)
```

`x` |
X coordinates of vertices. |

`y` |
Y coordinates of vertices. |

`d` |
Dimension of array to work along. |

If the optional `dim`

argument is given, then `polyarea`

works along this dimension of the arrays `x`

and `y`

.

Area(s) of polygon(s).

David Sterratt based on the octave sources by David M. Doolin

```
x <- c(1, 1, 3, 3, 1)
y <- c(1, 3, 3, 1, 1)
polyarea(x, y)
polyarea(cbind(x, x), cbind(y, y)) ## c(4, 4)
polyarea(cbind(x, x), cbind(y, y), 1) ## c(4, 4)
polyarea(rbind(x, x), rbind(y, y), 2) ## c(4, 4)
```

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