quadArea {omnibus} | R Documentation |
Area of a quadrilateral
Description
Calculates the area of a quadrilateral by dividing it into two triangles and applying Heron's formula.
Usage
quadArea(x, y)
Arguments
x |
Numeric vector. |
y |
Numeric vector. |
Value
Numeric (area of a quadrilateral in same units as x
and y
.
Examples
x <- c(0, 6, 4, 1)
y <- c(0, 1, 7, 4)
quadArea(x, y)
plot(1, type='n', xlim=c(0, 7), ylim=c(0, 7), xlab='x', ylab='y')
polygon(x, y)
text(x, y, LETTERS[1:4], pos=4)
lines(x[c(1, 3)], y[c(1, 3)], lty='dashed', col='red')
[Package omnibus version 1.2.13 Index]