Custom Format for (b-a)
- To: mathgroup at smc.vnet.net
- Subject: [mg5667] Custom Format for (b-a)
- From: Ersek_Ted%PAX1A at mr.nawcad.navy.mil
- Date: Sun, 5 Jan 1997 16:00:41 -0500
- Sender: owner-wri-mathgroup at wolfram.com
Hello Math Group,
When Mma displays an expression involving sums the terms are
always sorted. Consider the following example:
Exp[c+w (z-r)]+a(z-r)
This is displayed as:
Exp[c+w(-r+z)]+a(-r+z)
It comes out this way because Sort[{z, -r}]->{-r,z}.
I believe the output looks better if "z-r" is used rather than "-r+z".
I would only want it this way when two terms are added, and I would want it
to apply
regardelss of where the sum is in the expression.
I thnik this can be done using the following:
Format[Plus[Times[-1,a_], b_]]:= ..........some output...............
/;OrederedQ[a,b]
However, I haven't been able to come up with code that gives adequate
results.
Can anyone help?
T.E.