Re: Specifying arguments inside nested functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg46117] Re: Specifying arguments inside nested functions*From*: "Bo Le" <bole79 at email.si>*Date*: Sat, 7 Feb 2004 04:01:59 -0500 (EST)*References*: <bvvnse$j7v$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Helo, I don't really understand your specific problem with matricies, but like you, I also had the same problem with specifying arguments inside the nested functions. I am solving this problem with the Function[{vars},body], which is the construct behind the infix notation and marking local variables is what you want, right? Bye! Borut Slovenia "Ray Koopman" <koopman at sfu.ca> wrote in message news:bvvnse$j7v$1 at smc.vnet.net... > I have two matrices, A and B, that have the same number of columns. > I want to select the rows of A that differ in every position from > every row of B. So I write > > Select[A, And@@Map[Inner[Unequal,#1,#2,And]&, B]& ] > > But that won't work, because I have no way to tell Inner that one of > its arguments should be the row of A that is being tested by Select, > and the other argument should be the row of B from Map. > > Now, I realize that there are ways around the problem in this > particular case. For instance, the Select test could be > > And@@Map[FreeQ[Rest[#],First[#]]&, Transpose@Prepend[B,#]]& > > which checks B a column at a time and might well be more efficient. > However, this is not the first time I've run into the problem of > specifying arguments inside nested functions, and I wonder how other > people handle it. Is there a general solution, or must I always > ad hoc it? >