Re: Modifying an entry in array specified by a list of arbitrary length
- To: mathgroup at smc.vnet.net
- Subject: [mg127169] Re: Modifying an entry in array specified by a list of arbitrary length
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Thu, 5 Jul 2012 06:10:32 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
On 7/4/12 at 3:32 AM, samid.hoda at gmail.com wrote:
>I want to edit an element whose position is specified by an
>arbitrary list that is a result of a computation (the list is not of
>fixed length). Something like
>i = {1,2,3} Extract[X,i]+=1
>except that Extract passes X by value instead of by reference.
>Anyone have any ideas?
In[1]:= data = RandomReal[1, 5];
data + SparseArray[{2 -> 1}, Length@data]
Out[2]= {0.792931,1.11432,0.235235,0.730301,0.48574}