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Re: Problem with MatchQ and SameQ

• To: mathgroup at smc.vnet.net
• Subject: [mg56442] Re: Problem with MatchQ and SameQ
• From: David Bailey <dave at Remove_Thisdbailey.co.uk>
• Date: Tue, 26 Apr 2005 01:32:42 -0400 (EDT)
• References: <d4hvke$1i1$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Miguel wrote:
> Hi,
> Normally I operate with Mathematica 5.0. The functions MatchQ and
> SameQ work well  in a notebook but don't it in a programm.
> 
> For example,in a notebook
> Clear[f];
> In[1]: f[x_,y_,option_]:=
>   If[MatchQ[option,SolutionForm->Explicit],x+y,
>     If[MatchQ[option,SolutionForm->Implicit],x*y],Print["Eror"]]
> 
> In[2]:
> f[2,3,SolutionForm->Implicit]
> Out[2]:
> 6
> It works well.
> 
> In my programm,
> 
> <<Calculus`MyProgramm`
> In[3]:
> f[2,3,SolutionForm->Implicit]
> Out[2]:
> Error
> 
> Thanks
> 
This is not a question of notebook vs program - the problem (I assume) 
is that your program is in a package. You must add a usage statement 
(before the private section of your package) for both 'SolutionForm' and 
'Implicit' - even if the descriptive string is just empty!

I sense you are still fairly new to Mathematica, and it might be better 
to avoid creating your own packages for a bit. You can still create .M 
files and read them in even if they only contain definitions without a 
package structure.

David Bailey
dbaileyconsultancy.co.uk