Re: Adding value to some elements of a list

• To: mathgroup at smc.vnet.net
• Subject: [mg131052] Re: Adding value to some elements of a list
• From: Joerg Lenhardt <joerg.lenhardt at FernUni-Hagen.de>
• Date: Thu, 6 Jun 2013 07:30:28 -0400 (EDT)
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```Thanks to all for your support. It worked.

On 05.06.13 08:33, Adriano Pascoletti wrote:
> 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}
>
>
>
>
> 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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