MathGroup Archive: July 2012 [00064]

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Modifying an entry in array specified by a list of arbitrary length

To: mathgroup at smc.vnet.net
Subject: [mg127179] Modifying an entry in array specified by a list of arbitrary length
From: samid.hoda at gmail.com
Date: Wed, 4 Jul 2012 03:32:56 -0400 (EDT)
Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi,

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?

Thanks,
Sam

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