Building a list

*To*: mathgroup at smc.vnet.net*Subject*: [mg47114] Building a list*From*: Mark Coleman <mark at markscoleman.com>*Date*: Fri, 26 Mar 2004 03:56:00 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Greetings, I've got a relatively simple function f[a_,b_,c_,d_], where a and b are integers and c and d are lists (of reals), and f returns a real. I need to evaluate f on (potentially long) sets of lists and calculate a square "matrix" from the possible permutations of the elements in the lists. For instance If xlist={x1,x2,x3} I need to calculate {{f[a,b,x1,x1],f[a,b,x1,x2],f[a,b,x1,x3]},{f[a,b,x2,x1],f[a,b,x2,x2],f[a ,b,x2,x3]},{f[a,b,x3,x1],f[a,b,x3,x2],f[a,b,x3,x3]}} Note that f[a,b,c,d] does not equal f[a,b,d,c]. My first reaction was that Outer[] might do this, but I cannot seem to get it to work. I'd appreciate any suggestions. Thanks, Mark

**Follow-Ups**:**Re: Building a list***From:*Tomas Garza <tgarza01@prodigy.net.mx>

**Re: Building a list***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: Building a list***From:*Sseziwa Mukasa <mukasa@jeol.com>