RE: Mapping Functions That Take More Than One Argument

*To*: mathgroup at smc.vnet.net*Subject*: [mg69899] RE: [mg69864] Mapping Functions That Take More Than One Argument*From*: "David Annetts" <davidannetts at aapt.net.au>*Date*: Wed, 27 Sep 2006 06:04:01 -0400 (EDT)

Hi Gregory, > How can I map a functions onto sub-lists when the function > takes more than one argument. I can't seem to stumble upon > the right syntax. > > Here's a list of three sub-lists. > > {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}} > > I want to drop the first element of each sub-list, that is, 1 > from the first, 4 from the second, and 7 from the third. > > Drop[{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}, 1] > > gives me > > {{4, 5, 6}, {7, 8, 9}}, > > which is what I expected (I'm learning) but not what I want. > So, how do I apply Drop to each sub-list? There is Map ... a = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}} Drop[#, 1] & /@ a Running through some of the examples in 2.2.4 might throw some more light on other applications. Regards, Dave