<PRE><B>Question 197935</B>
find the product of the following matrices:
A=
2 -1 2 
-1 2 0
0 0 2
2 0 -3
---
A is a 4 by 3 matrix.
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B=
2 -1 2 
1 2 0
0 0 2
---
B is a 3 by 3 matrix
--------------------------

I also need to state which of the two products should be taken -A . B or B . A.
A*B works because the column count on A equals the row count on B.
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Can we sum up and A and B? 
No, because the dimensions are not the same.
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A=
   2 -1  2 
  -1  2  0
   0  0  2
   2  0  -3
    
B=
  2 -1  2 
  1  2  0
  0  0  2
     
AB = 
3  -4  4
0   5 -2
0   0  4
4  -2 -2
====================
Cheers,
Stan H.
</PRE>