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Transpose[A]*A wrong?

• To: mathgroup at smc.vnet.net
• Subject: [mg41129] Transpose[A]*A wrong?
• From: "Daniel Lidström" <daniel.lidstrom at _DELETE_home.se>
• Date: Mon, 5 May 2003 02:40:18 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

why does Mathematica give the wrong result here?

In[1]:= \!\(A\  = \ {{x\_11, x\_12, x\_13}, {x\_21, x\_22, x\_23}, {x\_31,
x\_32,
                x\_33}}\)

Out[1]= {{x  , x  , x  }, {x  , x  , x  }, {x  , x  , x  }}
           11   12   13     21   22   23     31   32   33

In[2]:= Transpose[A]*A

             2                                  2
2
Out[2]= {{x   , x   x  , x   x  }, {x   x  , x   , x   x  }, {x   x  , x   x
, x   }}
           11    12  21   13  31     12  21   22    23  32     13  31   23
32   33

Look at the diagonal elements for example.
Thanks!

/Daniel

-- 

Daniel Lidström

62 23' 25" N
17 15' 31" E

• Follow-Ups:
  • Re: Transpose[A]*A wrong?
    • From: "German Buitrago A." <gerbual@col2.telecom.com.co>