R: checking the sign of all terms in a long expression
- To: mathgroup at smc.vnet.net
- Subject: [mg132563] R: checking the sign of all terms in a long expression
- From: "Brambilla Roberto Luigi (RSE)" <Roberto.Brambilla at rse-web.it>
- Date: Sat, 12 Apr 2014 05:14:59 -0400 (EDT)
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- References: <20140411061009.8DE2B6A30@smc.vnet.net>
ceck= a + a b - a b c + a c - b + b c - d
a - b + a b + a c + b c - a b c - d (*NB rearranged order*)
pp = MonomialList[ceck] /. {a -> 1, b -> 1, c -> 1, d -> 1}
{-1, 1, 1, 1, 1, -1, -1}
Position[pp, -1]
{{1}, {6}, {7}}
-----Messaggio originale-----
Da: dantimatter [mailto:google at dantimatter.com]
Inviato: venerd=EC 11 aprile 2014 08:10
A: mathgroup at smc.vnet.net
Oggetto: checking the sign of all terms in a long expression
hello all
is there to check the signs of all terms in a symbolic expression, like
toCheck = a + a b + a b c + a c - b + bc + d ....
in this case, with the assumption that the a, b, c etc are all positive, only one term is negative (b by itself) and the rest are positive. I have expressions like this that have a hundred or more terms and i'm worried i might not be catching all those that are of a different sign.
thanks
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- References:
- checking the sign of all terms in a long expression
- From: dantimatter <google@dantimatter.com>
- checking the sign of all terms in a long expression