Re: odd behaviour in rule delayed

*To*: mathgroup at smc.vnet.net*Subject*: [mg21503] Re: [mg21499] odd behaviour in rule delayed*From*: Andrzej Kozlowski <andrzej at tuins.ac.jp>*Date*: Fri, 14 Jan 2000 02:43:24 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

The problem is very simple. The following works fine: In[9]:= list = {1, 0, 1, 0, 0, 1}; k = 0; newlist = {1, 0, 1, 0, 0, 1} /. (1 :> ++k) Out[9]= {1, 0, 2, 0, 0, 3} If you miss out the parentheses Mathematica interprets /.1 as division by 0.1 (at least Mathematica 4.0 does). Andrzej Kozlowski Toyama International University JAPAN http://sigma.tuins.ac.jp > From: Francisco Gutierrez <rpena at impsat.net.co> To: mathgroup at smc.vnet.net > Date: Wed, 12 Jan 2000 08:35:43 -0500 (EST) > To: mathgroup at smc.vnet.net > Subject: [mg21503] [mg21499] odd behaviour in rule delayed > > I have M 4.0, window 95. > I have a list of 0's and 1's, and I want the one's to perform a consecutive > numeration. For example, transform {1,0,1,0,0,1} into {1,0,2,0,0,3}. > > The easiest (and most elegant, I think) way to do it is with a counter and > rule delayed: > list={1,0,1,0,0,1} > kk=0; newlist={1,0,1,0,0,1} /.1:>++k > > However, the answer I get from this operation is completely > odd:{10.,0,10.,0,0,10.}:>++k. I closed my session and re-started my > computer, but I keep getting the same stuff. I don't understand what is > happening. By the way, this problem didn't appear in M3.0. > > Can somebody help me? > > Francisco Gutierrez > >