Re: Adding equations
- To: mathgroup at smc.vnet.net
- Subject: [mg14401] Re: Adding equations
- From: dreissBLOOP at bloop.earthlink.net (David Reiss)
- Date: Sun, 18 Oct 1998 15:10:06 -0400
- Organization: EarthLink Network, Inc.
- References: <703u1n$hup@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <703u1n$hup at smc.vnet.net>, Lawrence Walker <lwalker701 at earthlink.net> wrote: > Group: > > I've been trying to add two equations as follows: > > In[4]:= > a==b; > In[5]:= > c==d; > In[6]:= > %4+%5 > Out[6]= > (a==b)+(c==d) > > The result I was looking for is (a+c)==(b+d). The following works but it > seems clumsy. In[7]:= > %4[[1]]+%5[[1]]==%4[[2]]+%5[[2]] Out[7]= > a+c==b+d > Is there a way to elegantly add (sub, mult, div) two equations? Also is > there an elegant way to add (sub, mult, div) an expression to both > sides of an equation? > > Lawrence Walker MathSource has an item by Roman Maeder that does just this. See: "Automatic Threading of Equations Roman E. Maeder Make listable functions thread over equations as they do over lists. Allows for easy manipulation of equations. " This is at http://www.mathsource.com/Content/Enhancements/Algebraic/0209-124 --David Reiss *<>* David Reiss Editor-at-large for MathSource *<>* Email: dreiss at NOSPAMearthlink.net -- David Reiss dreissBLOOP at bloop.earthlink.net To send personal email, remove the words "bloop" and "BLOOP" from the email address