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