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Re: Transpose[A]*A wrong?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg41160] Re: [mg41129] Transpose[A]*A wrong?
  • From: Bobby Treat <drmajorbob+MathGroup3528 at mailblocks.com>
  • Date: Tue, 6 May 2003 05:59:23 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Transpose[A].A

Bobby

-----Original Message-----
From: Daniel Lidstrm <daniel.lidstrom at _DELETE_home.se>
To: mathgroup at smc.vnet.net
Subject: [mg41160] [mg41129] Transpose[A]*A wrong?

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


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