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MathGroup Archive 2004

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Re: function IF with several equality conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49096] Re: function IF with several equality conditions
  • From: "Mark Westwood [EPCC]" <markw at epcc.ed.ac.uk>
  • Date: Thu, 1 Jul 2004 05:25:42 -0400 (EDT)
  • Organization: Edinburgh University
  • References: <cbu37q$5m7$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Mukhtar

(1) do you mean  If[ And[x1>a , x2<a], 0, 1] ?  That is, are you trying 
to express a single compound condition ?  If so, you should also see the 
help files for Or, Not, and so on.  Note too that And[x1>a , x2<a] can 
be written as  x1>a && x2<a .

(2) If does accept equality conditions, but x=a is not an equality 
condition - it is an assignment statement, rather like a=1.  I think 
that you mean x==a, or perhaps x===a.


Hope this helps

Mark


Mukhtar Bekkali wrote:
> I have two questions that HELP file of Mathematica does not address:
> 
> (1) How do I implement IF with several conditions.  I tried something like this 
> 
> a=1;
> Table[If[{x1>a,x2<a},0,1],{x1,0,2},{x2,0,2}]
> 
> and get no results.
> 
> Also, (2) IF does not accept equality conditions either, say
> 
> a=1;
> Table[If[x=a,0,1],{x,0,2}]
> 
> I am surprised that such simple things are not covered by help file.
> 
> Thank you in advance, Mukhtar
> 


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