Question

In R, is there a way to plot 2D curves given by equations? For example, how can I plot the hyperbola given by equation x^2 – 3*y^2 + 2*x*y – 20 = 0?

Answer 1

You can use contour to plot the two branches of your hyperbola.

f <- function(x,y) x^2 - 3*y^2 + 2*x*y - 20
x <- y <- seq(-10,10,length=100)
z <- outer(x,y,f)
contour(
  x=x, y=x, z=z, 
  levels=0, las=1, drawlabels=FALSE, lwd=3
)