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MathGroup Archive 2007

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Re: return two different values

  • To: mathgroup at smc.vnet.net
  • Subject: [mg83872] Re: return two different values
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Mon, 3 Dec 2007 05:45:48 -0500 (EST)
  • Organization: The Open University, Milton Keynes, UK
  • References: <fitscg$4ft$1@smc.vnet.net>

vicky Al Aisa wrote:

> I am writing a module, from which i want to return 2 different values,
> one table and one just a normal int
> 
> i used this syntax in  module
> 
> Return[EMean,MeanImg];
> 
> and while receiving it in main program i use
> 
> {MeanX,RedMeanVec}=CalcMean[RedImg];
> 
> 
> is this correct, because i am getting some error..which mean that the
> arguments are not matching.
> so i tried to define those arguments , like i defined RedmeanVec as a
> table, but still it doesn work
> Error is below
> 
> 
> Break::nofunc
> Continue::nofunc
> Return::nofunc
> function::nofunc: Function f not found enclosing expr.
> 
> I use Mathematica 5.2

You must enclose the compound result within parentheses, i.e. you are 
returning a _list_ of values. Note that you can safely discard *Return* 
since Mathematica returns the value of the last statement evaluated.

In[1]:= f[data_] :=
  Module[{a, b}, a = Mean[data]; b = Total[data]; {a, b}]

{x, y} = f[{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}]

Out[2]= {{4, 5, 6}, {12, 15, 18}}

In[3]:= x

Out[3]= {4, 5, 6}

In[4]:= y

Out[4]= {12, 15, 18}

Regards,
-- 
Jean-Marc


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