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MathGroup Archive 2013

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Re: Adding value to some elements of a list

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  • Subject: [mg131043] Re: Adding value to some elements of a list
  • From: Adriano Pascoletti <adriano.pascoletti at uniud.it>
  • Date: Wed, 5 Jun 2013 04:38:38 -0400 (EDT)
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  • References: <20130605072741.946F96A19@smc.vnet.net>

In[1]:= a = {10, 20, 30, 40, 50, 60};
b = {2, 4, 6};
a[[b]] = a[[b]] + 17;
a
Out[4]= {10, 37, 30, 57, 50, 77}


Adriano Pascoletti


2013/6/5 Joerg Lenhardt <joerg.lenhardt at fernuni-hagen.de>

> 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
>
>


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