Ordering function weird?

*To*: mathgroup at smc.vnet.net*Subject*: [mg82645] Ordering function weird?*From*: Claus <claus.haslauer at web.de>*Date*: Sat, 27 Oct 2007 05:59:25 -0400 (EDT)*Organization*: Comp.Center (RUS), U of Stuttgart, FRG

Hi, say I've got two sets of number, x and y, which I want to rank. See the example below. I totally expect and want the result of Ordering[x]. But I neiter understand nor expect the result of Ordering[y]. Both Sort[x] and Sort[y] are ok. Can anybody explain to me Ordering[y]? Thanks, Claus In[3]:= x = {1, 2, 3, 6, 10, 3, 4} y = {1, 2, 7, 8, 9, 1, 2} Out[3]= {1, 2, 3, 6, 10, 3, 4} Out[4]= {1, 2, 7, 8, 9, 1, 2} In[5]:= Sort[x] Sort[y] Out[5]= {1, 2, 3, 3, 4, 6, 10} Out[6]= {1, 1, 2, 2, 7, 8, 9} In[7]:= Ordering[x] Ordering[y] Out[7]= {1, 2, 3, 6, 7, 4, 5} Out[8]= {1, 6, 2, 7, 3, 4, 5}

**Follow-Ups**:**Re: Ordering function weird?***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>