Re: reverse the order of replacements in a list of rules
- To: mathgroup at smc.vnet.net
- Subject: [mg105969] Re: [mg105954] reverse the order of replacements in a list of rules
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Mon, 28 Dec 2009 04:57:50 -0500 (EST)
- Reply-to: hanlonr at cox.net
revtoyrule = Reverse /@ toyrule Bob Hanlon ---- sean <sean_incali at yahoo.com> wrote: ============= Hello group, This is kinda related with my earlier question about lumping parameters. now that I have lumped my parameters, I would like to define a new rule that reverses the lumping. I could od it manually, but it just seem there should be a better way of doing it.. Suppose you have the following rule for replacing parameters. (in lumping, I used up all the letters in alphabet and about half of double struck letters. So the actual rule is very long.) toyrule = {k1 k2 -> a, k3 k4 k5 -> b, k4 k6 k7 -> c, k8 k9/k10 + k11 - > d } and so on and on. What I want to accomplish is now come up with reverse rule that with replace the lumped parameter with primitive parameters. revtoyrule = {a -> k1 k2, b -> k3 k4 k5 , c-> k4 k6 k7, d-> k8 k9/ k10 + k11} And so on. Thanks much in advance. Sean