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Re: Transformations in expressions
*To*: mathgroup at smc.vnet.net
*Subject*: [mg91911] Re: Transformations in expressions
*From*: Szabolcs Horvát <szhorvat at gmail.com>
*Date*: Fri, 12 Sep 2008 05:29:34 -0400 (EDT)
*Organization*: University of Bergen
*References*: <gaar3o$16q$1@smc.vnet.net>
Miguel wrote:
> Hi all,
> How can I to transform a specific expression to other by substitution
> of a part of it.
>
> For example, I want to transform the expression Log[x^2+y^3]/
> Sin[x^2+y^3] in Log[z]/Sin[z] by substitution x^2+y^3 --> z.
>
In[1]:= Log[x^2 + y^3]/Sin[x^2 + y^3] /. x^2 + y^3 -> z
Out[1]= Csc[z] Log[z]
> And other question: Is the new expression dependent of z. I see it is,
> but how can I to programar it.
>
I don't really understand this second question ...
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