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MathGroup Archive 2005

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Re: New to Mathematica- How to write functions????????

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58899] Re: New to Mathematica- How to write functions????????
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Sat, 23 Jul 2005 05:32:06 -0400 (EDT)
  • References: <dboufp$sse$1@smc.vnet.net> <dbq26s$6su$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

OT wrote:
> Someonekicked ha scritto:
> 
>>new to mathematica, looked at the help, but did not get the help i needed..
>>
>>I want to write a function that does multiple calculations in its body, then 
>>it returns a value.
>>I am talking about functions similar to functions that you can declare in 
>>C++.
>>can anyone give me an example?
>>
>>
>>in C++, a function would be like, (note int means integer)
>>
>>int zzz(int s, int y)
>>{
>>   int  Q;
>>   Q = s*y;
>>   return Q;
>>}
>>
>>
> 
> 
> this function in Mathematica would be:
> 
> xxx[s_Integer, y_Integer]:=Module[{Q},
>     Q = s*y;
>     Q
> ]
> 
> 
> more generally:
> 
> type_t function( some_input )
> {
>    int local_var_1;
>    double local_var_2;
> 
>    local_var_1=somefunction(some_input);
>    local_var_2=somefunction(some_input);
>    ...
>    ...
> 
>    return(local_var_2);
> }
> 
> wolud be:
> 
> function[someinput_]:=Module[{local1,local2),
>    local1=somefunction[someInput];
>    local2=somefunction[someInput];
>    ...
>    ...
> 
>    local2
> }
> 
> bye
> 
While you are at it, look up While, Which, and For (there is even a 
Goto, but I would leave that alone!). A lot of people prefer a 
functional style, but if you have a C background and want to get 
started, these are constructs you will recognise. Just be very careful 
to get the commas and semicolons in the right place.

David Bailey
http://www.dbaileyconsultancy.co.uk


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