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MathGroup Archive 2007

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Re: ToMatlab limitations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73585] Re: ToMatlab limitations
  • From: "Norbert Marxer" <marxer at mec.li>
  • Date: Thu, 22 Feb 2007 04:37:58 -0500 (EST)
  • References: <erh8tk$4qn$1@smc.vnet.net>

On 21 Feb., 12:03, "Will Robertson" <wsp... at gmail.com> wrote:
> [It is the policy of this newsgroup and mailing list to
> =C2=A0not discuss non-Mathematica systems, but since the ToMatlab
> =C2=A0package is provided on the Wolfram Research site, I am permitting
> =C2=A0it this time. =C2=A0- Moderator]
>
> Hello,
>
> I've stumbled across the ToMatlab package to extract some long
> equations derived in Mathematica to be used in an embedded controller
> via Matlab. It appeared to be the answer to all my problems, but I'm
> afraid it wasn't quite so handy as I initially thought.
>
> Two questions to try and salvage the situation; sorry for my ignorance
> -- I'm a very new Mathematica user.
>
> I've got a bunch of subscripted variables and I want to transform them
> into, well, "not subscripted" variables.
> For example, Subscript[x_, y_] -> xy.
> I'm embarrassed that even this simple task I can't complete. Obviously
> the variable "xy" doesn't match the x_ and y_, so I need instead a
> round-about way to get a concatentation of the two.
>
> Secondly, I've also got a bunch of Greek variables. Is there an
> automatic way (that is, without enumerating them all in a
> ReplaceAll[]) to swap out the unicode character with their "name"?
> E.g., {\[alpha] -> alpha} for all the greek letters and variant greek
> letters?
>
> (Oh how I wish Matlab would accept unicode characters for variable
> names.)
>
> Many thanks in advance,
> Will Robertson

Hi Will

This will convert the subscripted variable to a symbol (as you can see
with Head):

Subscript[c, f] /. {Subscript[x_, y_] :>
ToExpression[StringJoin[ToString[x],ToString[y]]]}
Head[%]

This will convert the Greek variable:

ToExpression[StringTake[ToString[FullForm[=CE=B1]],  {3, -2}]]
Head[%]

Best Regards
Norbert Marxer

www.mec.li



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