constraint

*To*: mathgroup at smc.vnet.net*Subject*: [mg32741] constraint*From*: sahni mayank <sahnimayank at yahoo.com>*Date*: Thu, 7 Feb 2002 05:12:24 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

i'm having problems with inserting an algebraic constraint into a series of differential equations and solving with NDSolve. for example sol1 = NDSolve[{ y1'[t] == 0.5*k2 + k4*y2[t]*y3[t] - k10*y1[t]*y4[t], y2'[t] == k1 + k3 + k5*y1[t]*y1[t] - k4*y2[t]*y3[t], y3'[t] == k9*y3[t]*y1[t] - k4*y2[t]*y3[t] - k8*y1[t]*y3[t], and instead of using a differential eq for y4[t] i want to use an algebraic equation for example y4[t]=k12-y1[t]-y2[t], is it possible to solve this using NDSolve? __________________________________________________ Do You Yahoo!? Send FREE Valentine eCards with Yahoo! Greetings! http://greetings.yahoo.com

**Follow-Ups**:**Re: constraint***From:*Daniel Lichtblau <danl@wolfram.com>