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Adding value to some elements of a list

• To: mathgroup at smc.vnet.net
• Subject: [mg131032] Adding value to some elements of a list
• From: Joerg Lenhardt <joerg.lenhardt at FernUni-Hagen.de>
• Date: Wed, 5 Jun 2013 03:27:41 -0400 (EDT)
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• Delivered-to: l-mathgroup@wolfram.com
• Delivered-to: mathgroup-outx@smc.vnet.net
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Hello,

I have two lists. One containing values, another containing indexes to
the first list. I want to add a value to all elements of the first list
when its index is in the second list:

a={10,20,30,40,50,60}

b={2,4,6}

c=17

==>

{10,20+17,30,40+17,50,60+17}

I would be glad if anyone have a simple solution for that problem - I am
convinced there is one ...

Best regards
J. Lenhardt

• Follow-Ups:
  • Re: Adding value to some elements of a list
    • From: Sseziwa Mukasa <mukasa@gmail.com>
  • Re: Adding value to some elements of a list
    • From: Ulrich Arndt <ulrich.arndt@data2knowledge.de>
  • Re: Adding value to some elements of a list
    • From: Adriano Pascoletti <adriano.pascoletti@uniud.it>