RE: Pattern Matching in Lists
- To: mathgroup at smc.vnet.net
- Subject: [mg35583] RE: [mg35547] Pattern Matching in Lists
- From: "Florian Jaccard" <jaccardf at eicn.ch>
- Date: Fri, 19 Jul 2002 06:09:59 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello Anthony !
Here a much better method then the one I posted yesterday.
It has been found by Jean Beiner :
In[44]:=
count10[list_]:=Count[Partition[list,2,1],{1,0}]
In[49]:=
example=Table[Random[Integer,{0,1}],{25}]
Out[49]=
{1,1,1,0,1,1,0,1,1,1,0,1,0,0,1,0,0,0,0,0,1,0,0,1,1}
In[50]:=
count10[example]
Out[50]=
6
Meilleures salutations
Florian Jaccard
EICN-HES
e-mail : jaccardf at eicn.ch
-----Message d'origine-----
De : Anthony Mendes [mailto:amendes at zeno.ucsd.edu]
Envoyé : jeu., 18. juillet 2002 09:07
À : mathgroup at smc.vnet.net
Objet : [mg35547] Pattern Matching in Lists
Hello,
Suppose w={1,1,1,0,0,1,0,1,0,0,1,0,0}.
How can I count the number of occurrences of a 1 in w immediately
followed by a 0 in w?
I have tried every incarnation of Count[] I can think of; for example,
Count[w,{___,1,0,___}]
does not seem to work. In general, how can I count the number of
occurrences of a 1 followed by a 0 in a list of 1's and 0's? Thank you!
--
Tony
_____________________
amendes at math.ucsd.edu