Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Function defined with If

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

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.


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


  • Prev by Date: Patterns_ to define linear operators?
  • Next by Date: Re: List difference using patterns and substitutions.
  • Previous by thread: Re: Function defined with If
  • Next by thread: RE: Function defined with If