• To: mathgroup at smc.vnet.net
• Subject: [mg65797] Re: adding matrices
• From: "J Siehler" <jsiehler at gmail.com>
• Date: Mon, 17 Apr 2006 02:28:53 -0400 (EDT)
• References: <e1sv6v\$ct3\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```>if i type m-p, mathematica treats the second matrix p as a scalar and subtracts that entire 3x3
>matrix p from each entry of m

If m and p have the same dimensions then Mathematica will subtract (or
add) entry-by-entry the way you want.  You might want to clarify what
you mean by "subtracts [a matrix] from each 3x3 entry m" because that's
a little unclear; better, post your code so we can see what's
happening.

--

In[8]:=
m=Array[Random[Integer,{-10,10}]&,{3,3}]
p=Array[Random[Integer,{-10,10}]&,{3,3}]

Out[8]=
{{6,1,-7},{2,9,-3},{1,1,8}}

Out[9]=
{{1,9,5},{-3,-10,9},{9,5,6}}

In[10]:=
m-p

Out[10]=
{{5,-8,-12},{5,19,-12},{-8,-4,2}}

```

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