Re: Riddle with Ordering
- To: mathgroup at smc.vnet.net
- Subject: [mg77939] Re: Riddle with Ordering
- From: Ray Koopman <koopman at sfu.ca>
- Date: Wed, 20 Jun 2007 05:30:45 -0400 (EDT)
- References: <f58dbg$8gi$1@smc.vnet.net>
On Jun 19, 4:06 am, nazdro... at gmail.com wrote: > Just a gem I discovered with Ordering[ ]. > > Anyone have an idea what > > SomeArrayWithUniqueReals // Ordering // Ordering > > does? > > I like this, especially the double use of Ordering. Answer tomorrow. Ordering@Ordering@x gives the ranks of the elements of x, with ties broken according to position in x. To give tied values their average rank, use (Ordering@Ordering@x + Reverse@Ordering@Ordering@Reverse@x)/2