Re: can't find info about & /@ %

*To*: mathgroup at smc.vnet.net*Subject*: [mg121913] Re: can't find info about & /@ %*From*: Heike Gramberg <heike.gramberg at gmail.com>*Date*: Thu, 6 Oct 2011 04:24:31 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201110050759.DAA06921@smc.vnet.net>

& is shorthand for Function. It's used in Postfix notation so expr & is the same as Function[expr]. The parameters of the function are denoted with #1 (or #), #2, =85 etc. /@ is short for Map. Instead of using f /@ {a, b, c} you can also write Map[f, {a,b,c}] which returns {f[a], f[b], f[c]}. %, or Out[], gives the last result generated (which in your case is probably a list of images). So in summary, your example could have been written as First[Map[Function[Options[#, "ColorSpace"]], Out[]]] Heike. On 5 Oct 2011, at 09:59, Richard Cohen wrote: > First[Options[#, "ColorSpace"] & /@ %] > could someone please explain the use of these & /@ % > i've looked everywhere to no avail. > rich >

**References**:**can't find info about & /@ %***From:*Richard Cohen <cohenrich@gmail.com>