Lists of Equations

*To*: mathgroup at smc.vnet.net*Subject*: [mg106307] Lists of Equations*From*: Michael Knudsen <micknudsen at gmail.com>*Date*: Fri, 8 Jan 2010 04:13:37 -0500 (EST)

Hello, I have just started using Mathematica, and I wonder what the easiest way to manage a large set of equations is. I have a bunch of differential equations y1'[x] = z1[x] y2'[x] = z2[x] ... yn'[x] = zn[x] and I have grouped them together in a list like eqs = {y1'[x]==z1[x], ..., yn'[x]==zn[x]} which fits perfectly as an argument to NDSolve. However, I think that, at a later point, I may have to use z1,...,zn separately, and I thought about defining yeqs = {y1'[x],...,yn'[x]} zeqs = {z1[x],...,zn[x]} and them combine them. What I would really like is something like yeqs + "==" + zeqs but I can't seem to find any list operation that will do that. Any help is appreciated. Thanks, Michael Knudsen