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MathGroup Archive 2006

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Re: Function defined with If

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71401] Re: Function defined with If
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 16 Nov 2006 00:54:53 -0500 (EST)
  • Organization: hispeed.ch
  • References: <ejevq7$216$1@smc.vnet.net>


Hi Julian,

Attributes[If] will tell you that If has the attribute HoldRest what 

explains you result. However, I can not explain the meaning of this.

Daniel



Julian Aguirre wrote:

> Dear group,

> 

> I am trying to define a function of the variables x, y through other

> quantities depending on x and y and the function If. A minimal example

> is

> 

> In[1]:=

> a = x;

> b = y;

> f[ x_, y_ ] = If[ a < b, a, b ]

> Out[3]=

> If[ x < y, a, b ]

> 

> How can I force Mathematica to return If[ x < y, x, y ], as I thought

> it would?

> 

> Thaks in advance,

> 

> Julián Aguirre

> 



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