Substitutions
- To: mathgroup at smc.vnet.net
- Subject: [mg77898] Substitutions
- From: SK <skhushrushahi at gmail.com>
- Date: Tue, 19 Jun 2007 06:41:15 -0400 (EDT)
Hi
Ive had this problem come up quite often and I was wondering if
someone could help me. I have expressions that are quite complex
and
what I would like to do is define a new non-dimensional parameter
that
would have many of the variables of the expression clumped in it
and
that would reduce the complexity of my expression. I have used /.
but
Ive realized that unless what I want to replace is of the exact
fractional form it wont substitute.
This is my problem
http://mit.edu/shahriar/Public/1.bmp
and say I want to rewrite this equation using new non-dimensional
parameters such
http://mit.edu/shahriar/Public/2.bmp
Another example of this is I have an equation (http://mit.edu/
shahriar/Public/3.bmp ) and I want to replace Bx/=CE=BC0 with a new
variable say B_x Mathematica wont do it unless it is exactly like the
form Bx/=CE=BC0 so a rule like Bx/=CE=BC0 ->B_x is useless in dealing with =
this.
If someone would help, i would be very grateful. Thanks
