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Re: Assigning part of indexed object

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119799] Re: Assigning part of indexed object
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Thu, 23 Jun 2011 07:24:17 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

m[1] = Range[5, 1, -1]

{5, 4, 3, 2, 1}

m1 = ReplacePart[m[1], 1 -> 10]

{10, 4, 3, 2, 1}


Bob Hanlon

---- "Fabrice P. Laussy" <fabrice.laussy at n0spam-gmail.com> wrote: 

=============
How do you set the part of an indexed object, say:

m[1] = Range[5];

is my indexed object (I could have m[2], etc.). Now I 
want to do something like:

m[1][[1]] = 10;

with effect of having m[1] read:

{10, 2, 3, 4, 5}

but of course the line above evaluates to 1 = 10.

This could be achieved by having a non-indexed object get 
in the way, e.g., m1=m[1], assign m1 and then return to 
m[1]=m1, but I believe there should a more elegant way.



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