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Topic: extract from Reduce
Replies: 3   Last Post: Apr 6, 2013 5:10 AM

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Bob Hanlon

Posts: 906
Registered: 10/29/11
Re: extract from Reduce
Posted: Apr 4, 2013 10:30 PM
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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@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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