Re: odd behaviour in rule delayed

*To*: mathgroup at smc.vnet.net*Subject*: [mg21513] Re: odd behaviour in rule delayed*From*: Tobias Oed <tobias at physics.odu.edu>*Date*: Fri, 14 Jan 2000 02:43:31 -0500 (EST)*Organization*: Old Dominion University*References*: <851dn1$43k@smc.vnet.net> <200001070520.AAA08503@smc.vnet.net> <85i124$1qh@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Francisco Gutierrez wrote: > > 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 first, there is the kk=0; that sould be k=0; then there is the /.1 that should be /. 1 (note the space). What you entered is parsed as a delayed rule with on the left hand side {1,0,1,0,0,1} divided by .1 and the rhs ++k. Tobias

**References**:**Re: Using Mathematica to Create Technical Documents***From:*"Tony Duffy" <tduffy@uswest.net>