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second simple problem

• To: mathgroup at smc.vnet.net
• Subject: [mg99667] second simple problem
• From: Francisco Gutierrez <fgutiers2002 at yahoo.com>
• Date: Sun, 10 May 2009 05:19:36 -0400 (EDT)

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      

• Follow-Ups:
  • Re: second simple problem
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: second simple problem
    • From: Adriano Pascoletti <adriano.pascoletti@dimi.uniud.it>