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Re: extract from Reduce

  • To: mathgroup at smc.vnet.net
  • Subject: [mg130365] Re: extract from Reduce
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Thu, 4 Apr 2013 22:33:56 -0400 (EDT)
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  • References: <20130404025057.81F326A68@smc.vnet.net>

a := x == 3 || x == 4 || x == 7


x /. {a // ToRules}


{3, 4, 7}



a := x == 6


x /. {a // ToRules}


{6}



Bob Hanlon




On Wed, Apr 3, 2013 at 10:50 PM, <hamiltoncycle at gmail.com> wrote:

> I have a result from the command Reduce that looks like this (as an
> example):
>
> a:= x==3||x==4||x==7
>
> I need to extract the numbers but I can't find a nice way to handle the
> case when there is only one equation, for instance:
>
> a:= x==6
>
> currently I check what the head of the expression is (Head[a]) and handle
> the case Head[a]=Or with a Map[] and the case Head[a]="Equal" with a[[2]].
> Not very nice, but I guess that there is a neat way to do it.
>
> cheers, Robert
>
>




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