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Re: Function defined with If

• To: mathgroup at smc.vnet.net
• Subject: [mg71386] Re: Function defined with If
• From: "ben" <benjamin.friedrich at gmail.com>
• Date: Thu, 16 Nov 2006 00:53:45 -0500 (EST)
• References: <ejevq7$216$1@smc.vnet.net>

Hi

Be careful with = and :=

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

Bye
Ben

Julian Aguirre schrieb:

> 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