Re: local symbols inside Module

*To*: mathgroup at smc.vnet.net*Subject*: [mg56029] Re: [mg55950] local symbols inside Module*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Thu, 14 Apr 2005 08:54:20 -0400 (EDT)*References*: <200504120926.FAA27549@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On 12 Apr 2005, at 18:26, OT wrote: > Hi all, I have some problems in working with local variables inside > Module: I wrote this function: > > RealLinearCombination[v_List]:=Module[{d,coeffs}, > d=Legth[v]; > > coeff=Table[ToExpression["c"<>ToString[k]],{k,d}]; > > coeffs=coeffs/.Solve[eqns,coeffs]; > > ... > ... > > ] > > The function works, but has a big limitation: the elements of the list > coeffs are not local symbols! > > Since the elements of the list coeffs are not local variables, if I run > my function when I have already initialized a symbol like c3=Pi, say, I > get an error because mathematica tries to execute > Solve[eqns,{c1,c2,Pi,c4,...,cd}] since c3 has been already initialized > as a number. > > So, my question is: how can I initialize a local list of symbols > {c1,...cd} inside a Module, when d is an argument supplied to the > Module > itself? > > Thanks for every answer! > > > Since obviously you do not need your local variables to be named in c1, c2 etc, you might as well simply use: RealLinearCombination[v_List]:=Module[{d,coeffs,c}, d=Legth[v]; coeffs = Map[Unique, Table[c, {d}]]]; coeffs=coeffs/.Solve[eqns,coeffs]; ... ... ] Andrzej Kozlowski Chiba, Japan http://www.akikoz.net/andrzej/index.html http://www.mimuw.edu.pl/~akoz/

**References**:**local symbols inside Module***From:*OT <montoz@iol.it>