How to draw several contours for one function, while only one contour

*To*: mathgroup at smc.vnet.net*Subject*: [mg127675] How to draw several contours for one function, while only one contour*From*: loveinla at gmail.com*Date*: Tue, 14 Aug 2012 04:24:02 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

Dear all, Suppose I have two implicit functions, say, F(x, y) and G(x, y); both involve a parameter a. In one Animate, I need: (1) several contours for function F(x, y) with its Max and Min values; (2) only one contour for function G(x, y)==0. (3) because I need to see how they change as parameter a changes, I want to use Animate to generate animation. Can anybody help? Thanks.

**Follow-Ups**:**Re: How to draw several contours for one function, while***From:*Bob Hanlon <hanlonr357@gmail.com>