26.11.3  Parabola in the plane

For parabolas in space, see Section 27.9.4.

The parabola command draws parabolas and other conic sections. parabola can take parameters in two different ways.

• parabola can take one argument: eqn, a second degree equation in the variables x and y (or an expression which will be set to zero).
• parabola(eqn) returns and draws the conic section given by the equation eqn.
• Alternatively, parabola can take two arguments: F,V, two points, or
  • A=(a,b), a point.
  • c, a real number.
• parabola(F,V) returns and draws the parabola with focus F and vertex V.
• parabola(A,c) returns and draws the parabola y=b+c(x−a)².

Examples