Re: Pattern matching in lists

*To*: mathgroup at smc.vnet.net*Subject*: [mg116120] Re: Pattern matching in lists*From*: Daniel Lichtblau <danl at wolfram.com>*Date*: Thu, 3 Feb 2011 05:26:28 -0500 (EST)

----- Original Message ----- > From: "Harvey P. Dale" <hpd1 at nyu.edu> > To: mathgroup at smc.vnet.net > Sent: Wednesday, February 2, 2011 5:07:02 AM > Subject: [mg116096] Pattern matching in lists > MemberQ easily tests whether a single integer appears in a list > of integers. Suppose, however, that I want to test not for a single > integer but for two or more consecutive integers, e.g., to see whether > {1,4,6} is a member of {1,3,2,6,5,1,4,6,3,9}. I can do this by > converting both lists into strings and then using string-matching > functions, but is there some way of doing it directly without that > conversion? > > Thanks. > > Harvey > > Harvey P. Dale > [...] In[7]:= Or @@ ListCorrelate[{1, 4, 6}, {1, 3, 2, 6, 5, 1, 4, 6, 3, 9}, {-1, 1}, {}, Equal, And] Out[7]= True I've no idea why all the optional arguments to ListConvolve/Correlate were not made into Options. This strikes me as a particularly flawed aspect in the design of these otherwise excellent functions. Daniel Lichtblau Wolfram Research