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MathGroup Archive 2006

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Re: function's local constants interdependence

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69617] Re: function's local constants interdependence
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 17 Sep 2006 22:45:50 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <eejaql$40m$1@smc.vnet.net>

rych wrote:
> Could someone please help me find a decent way to have local constants
> defined using one another in order?
> Simple "With[" doesn't work:
> 
> Clear[a,b,x,y]
> ff[x_,y_]:=With[{a=x, b=2*a},{a,b}]
> ff[x,y]
>> {x,2 a}
> 
> where I'd like it be >{x, 2 x}. I suspect it would work with "Module["
> but I especially wanted them to be constants.
> 
> Do I have to nest With[ ? Or is there a prettier way?
> Thanks
> Igor
> 
In[1]:=
Clear[a, b, x, y]
ff[x_, y_] := With[{a = x}, With[{b = 2*a}, {a, b}]]
ff[x, y]

Out[3]=
{x, 2*x}

Jean-Marc


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