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Re: Converting a number back to a symbol?
 To: mathgroup at smc.vnet.net
 Subject: [mg82918] Re: Converting a number back to a symbol?
 From: "Dr. Wolfgang Hintze" <weh at snafu.de>
 Date: Sat, 3 Nov 2007 03:27:34 0500 (EST)
 References: <fgenct$fsd$1@smc.vnet.net>
 Replyto: "Dr. Wolfgang Hintze" <weh at snafu.de>
"AES" <siegman at stanford.edu> schrieb im Newsbeitrag
news:fgenct$fsd$1 at smc.vnet.net...
> If we have an expression containing integer powers of the symbol u0
> and
> we know that u0's numerical value is (or at least eventually will be)
> u0
> = Pi/2, we know what happens if we write
>
> expr /. {u0 > Pi/2}
>
> But what about the reverse case: we have an expression containing
> various integer powers of Pi, and we want to replace all the
> explicitly
> appearing Pi's by 2 u0. Writing
>
> expr /. {Pi> 2 u0}
>
> doesn't seem to do it.
>
> Is there a way?
>
I don't see the problem:
Here's an example (Pi is always being entered from the keyboard using
the sequence ESC p ESC)
In[1]:=
a = 2 \[Pi] (* entered with ESC p ESC *)
Out[1]=
2*Pi
In[4]:=
a /. {Pi > pu}
Out[4]=
2*pu
Cheers,
Wolfgang
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