Re: extract from Reduce
- To: mathgroup at smc.vnet.net
- Subject: [mg130356] Re: extract from Reduce
- From: awnl <awnl at gmx-topmail.de>
- Date: Thu, 4 Apr 2013 22:30:55 -0400 (EDT)
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- Delivered-to: l-mathgroup@wolfram.com
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- References: <kjkc5k$7n0$1@smc.vnet.net>
Hi, > 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. > There might be more efficient ways to do this, but I think this is clear and compact: Cases[{a}, Equal[x, v_?NumericQ] :> v, Infinity] hth, albert