overlap: Area of overlap between two estimated ellipses
In siar: Stable Isotope Analysis in R

Description Usage Arguments Value Author(s)

Given the coordinates of two bivariate samples, this function calculates (computationally) the area of overlap between two standard ellipses. Note, be sure to use a sufficiently low step size when creating the ellipses (i.e. to ensure that there is no excessive discretising of the elliptical shape). As a result of this process, you will inevitably underestimate the true ellipse areas and hence their overlap (although this bias is likely to be inconsequential) if a suitable fine scale is chosen for the step size. There is no single rule for making this choice as it depends on the angle and shape of the ellipse but a step-size of 1 should be more than sufficient in most cases (N.B. the default steps=5). The ellipses calculated are the small sample size corrected standard ellipses.

1	overlap(x1,y1,x2,y2,steps = 5)

`x1`	A vector containing the x coordinates of the first data.
`y1`	A vector containing the y coordinates of the first data.
`x2`	A vector containing the x coordinates of the second data.
`y2`	A vector containing the y coordinates of the second data.
`steps`	The number of steps in degrees to estimate points on the curve.