Re: Mapping a scalar against a list

*To*: mathgroup at smc.vnet.net*Subject*: [mg28400] Re: Mapping a scalar against a list*From*: "Allan Hayes" <hay at haystack.demon.co.uk>*Date*: Mon, 16 Apr 2001 03:28:51 -0400 (EDT)*References*: <9bb7q7$969@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Mark, We can ignore, or turn off, the message generated below. In[6]:= Thread[StringMatchQ["ab",{"aab", "bb", "ab"}]] StringMatchQ::string: String expected at position 2 in \ StringMatchQ[ab,{aab,bb,ab}]. Out[6]= {False,False,True} Here's another way of avoiding the message: In[7]:= Block[{StringMatchQ},Thread[StringMatchQ["ab",{"aab", "bb", "ab"}]] ] Out[7]= {False,False,True} -- Allan --------------------- Allan Hayes Mathematica Training and Consulting Leicester UK www.haystack.demon.co.uk hay at haystack.demon.co.uk Voice: +44 (0)116 271 4198 Fax: +44 (0)870 164 0565 "Mark Coleman" <mcoleman at bondspace.com> wrote in message news:9bb7q7$969 at smc.vnet.net... > Greetings, > > I've recently been working on a problem involving determining whether a > given string is contained in a large list of strings. Ideally, the problem > would be solved by a 'Map' function 'M' defined as > > M[f,{a,{b,c,d,...}}]= {f[a,b],f[a,c],f[a,d],...} > > For this particular problem, {a} is a stiring, and {b,c,d,...} is a list of > strings, then f=StringMatchQ. The function 'M' does not appear to match up > against the standard Mathematica list functions. My current solution is to 'expand' > the list {a} into a list of size Dimension[{b,c,d,...}] and then use > MapThread. But this does not seem particularly elegant, especially if the > list is very large. > > Any suggestions would be most welcome! > > Thanks, > > Mark > >