Re: What is @@@?

*To*: mathgroup at smc.vnet.net*Subject*: [mg87194] Re: What is @@@?*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Fri, 4 Apr 2008 02:54:51 -0500 (EST)*Organization*: University of Bergen*References*: <ft2au1$ph5$1@smc.vnet.net>

Kevin J. McCann wrote: > I have seen several references to the command @@@ in this newsgroup, but > a query of the online Documentation Center just refers me to Apply (@@). > What does it do and where can I read about it? > Hi Kevin, @@@ is "apply at level 1". f @@@ expr is equivalent to Apply[f, expr, {1}]. This is under "more information" on the doc page of Apply[]. It is easy to remember the sytax: each of @, @@, and @@@ act at a deeper level: In[1]:= f@{{1, 2}, {3, 4}} Out[1]= f[{{1, 2}, {3, 4}}] In[2]:= f @@ {{1, 2}, {3, 4}} Out[2]= f[{1, 2}, {3, 4}] In[3]:= f @@@ {{1, 2}, {3, 4}} Out[3]= {f[1, 2], f[3, 4]} But there is no @@@@, it only goes until @@@. Szabolcs