Re: adding matrices

*To*: mathgroup at smc.vnet.net*Subject*: [mg65792] Re: adding matrices*From*: Bill Rowe <readnewsciv at earthlink.net>*Date*: Mon, 17 Apr 2006 02:28:49 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

On 4/16/06 at 3:49 AM, ac7220 at wayne.edu (francis hu7xley) wrote: >am fairly new to mathematica. simply want to add two 3x3 matrices >together(actually, subtract). if they are called m and p, 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. the help >contents do not seem to address this issue!!! there must be a simple >way of doing this?? Hmm... With version 5.2 running on Mac OS 10.4.6 I don't get the result you describe. Instead doing In[6]:= m = Table[Random[], {3}, {3}] Out[6]= {{0.248054090808991, 0.08175882048928461, 0.09171130051093868}, {0.9320093048442182, 0.811932501327654, 0.4762175089976257}, {0.9632985629564331, 0.2848638564009711, 0.37751589172137134}} In[7]:= p = Table[Random[Integer, {1, 10}], {3}, {3}] Out[7]= {{5, 1, 1}, {3, 6, 4}, {7, 4, 1}} In[8]:= p - m Out[8]= {{4.751945909191009, 0.9182411795107154, 0.9082886994890613}, {2.067990695155782, 5.188067498672346, 3.5237824910023745}, {6.0367014370435665, 3.715136143599029, 0.6224841082786287} Seems to return the result you want. Perhaps if you provided a sample of the code you are using? -- To reply via email subtract one hundred and four