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Re: mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65800] Re: mathematica
  • From: "J Siehler" <jsiehler at gmail.com>
  • Date: Mon, 17 Apr 2006 02:28:56 -0400 (EDT)
  • References: <e1supm$chd$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

liv elena wrote:
>   ai have the next code :
>   a = {{1, 4}, {34, 5}}
>   b = {{12, 4}, {4, 35}}
>   and ai want to obtain a matrix like this:
>   rez={{1+12,4+4},{34+4,5+35}}

In[1]:=
inertPlus[l___]:=HoldForm[Plus[l]]
SetAttributes[inertPlus,Listable]

In[3]:=
a={{1,4},{34,5}};
b={{12,4},{4,35}};

In[5]:=
inertPlus[a,b]

Out[5]=
{{1+12,4+4},{34+4,5+35}}

In[6]:=
ReleaseHold[%]

Out[6]=
{{13,8},{38,40}}

In[7]:=
inertPlus[a,b,a]

Out[7]=
{{1+12+1,4+4+4},{34+4+34,5+35+5}}


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