Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Substitutions

  • To: mathgroup at
  • Subject: [mg77896] Re: Substitutions
  • From: "Shahriar Khushrushahi" <shahriar at>
  • Date: Tue, 19 Jun 2007 06:40:13 -0400 (EDT)
  • References: <>


>  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

>  and say I want to rewrite this equation using new non-dimensional
> parameters such

 Another example of this is I have an equation (
> ) and I want to replace Bx/ì0 with a
> new variable say B_x Mathematica wont do it unless it is exactly like the
> form Bx/ì0 so a rule like Bx/ì0 ->B_x is useless in dealing with this.

 If someone would help, i would be very grateful. Thanks

  • Prev by Date: Re: Indefinate integrals, erroneus Natural log?
  • Next by Date: Re: Trying to export two column table to text file
  • Previous by thread: Substitutions
  • Next by thread: Re: Substitutions