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Re: odd behaviour in rule delayed


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


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