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Re: second simple problem

  • To: mathgroup at
  • Subject: [mg99686] Re: second simple problem
  • From: Jens-Peer Kuska <kuska at>
  • Date: Mon, 11 May 2009 06:24:12 -0400 (EDT)
  • References: <gu666q$9tf$>


i = 1;
ex /. "M" :> rL[[i++]]


Francisco Gutierrez wrote:
> Dear sirs:
> I have the following list:
> ex={1,5,7,4,"M",6,7,8,9,1,"M",3}
> I want to replace the M's in the following way: the first M by 5, and the second by2.
> Thus I have a replacement list
> rL={5,2}
> The problem is to get ={1,5,7,4,5,6,7,8,9,1,2,3}
> How can I do this in the most general form (for any length of ex and any number of values of "M")?
> Thanks
> Francisco      

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