parabola.invarclength: Inverse arc length of a parabola y=x^2/4f
Description
Inverse arc length of a parabola y=x^2/4f
Usage
parabola.invarclength(x1, s, f)
Arguments
x1
co-ordinate of start of arc
s
length of parabola arc to follow
Value
x co-ordinate of end of arc