Do you know a convenient way to do this in the animation function/context? I am actually trying to make a pair of opposing waves that converge into a spiral. I have seen a parametric equation pair that does just this but can no longer find it. The result is what looks like a modulated signal that moves from the second quadrant into the first quadrant and then begins to spin around in a spiral. It's more complicated than simple standing waves...I think it has a cos() with a decaying exponent exp() piece that begins to dominate the sinusoid in the first quadrant and causes the modulated signal to collapse in a spiral....I think you can make a torque on the end of a standing wave. That's what I'm investigating.

Do you know a convenient way to do this in the animation function/context? I am actually trying to make a pair of opposing waves that converge into a spiral. I have seen a parametric equation pair that does just this but can no longer find it. The result is what looks like a modulated signal that moves from the second quadrant into the first quadrant and then begins to spin around in a spiral. It's more complicated than simple standing waves...I think it has a cos() with a decaying exponent exp() piece that begins to dominate the sinusoid in the first quadrant and causes the modulated signal to collapse in a spiral....I think you can make a torque on the end of a standing wave. That's what I'm investigating.