Re: can't find info about & /@ %
- To: mathgroup at smc.vnet.net
- Subject: [mg121911] Re: can't find info about & /@ %
- From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
- Date: Thu, 6 Oct 2011 04:24:06 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <j6h31i$6un$1@smc.vnet.net>
Hi Richard, These are actually three operators: & (Function) is part of a pure function expression: e.g. #^2& is a function that squares it argument; # stands for the argument /@ is the infix form of the Map function, which can be used to map a function over a list of items % (Out) is the shorthand notation for the result returned in the most recent evaluation (presumably in this case the evaluation returned a list of items) How could you have found out this yourself? Well, - select the '&', press F1 (Help on Windows) and the second item is 'Function' - select /@, press F1 and the only result is 'Map' - select '%', press F1 and the second result is `Out` It's actually not that difficult. Cheers -- Sjoerd On Oct 5, 10:04 am, Richard Cohen <cohenr... at gmail.com> wrote: > First[Options[#, "ColorSpace"] & /@ %] > could someone please explain the use of these & /@ % > i've looked everywhere to no avail. > rich