From: astroelectronic@t-online.de   
      
   Am Mittwoch, 15. Juli 2015 22:05:45 UTC+2 schrieb Phil Hobbs:   
   > On 07/15/2015 03:59 PM, Michael Koch wrote:   
   > > Phil,   
   > >   
   > > thanks for your answer. Points 1 and 3 are clear. Point 2 is   
   > > difficult to understand for me. I have an input which is described by   
   > > a 2x2 matrix, then I make any operation which is also described by a   
   > > 2x2 matrix, and the output is also a 2x2 matrix. I would understand   
   > > it if input and output were vectors. Can a matrix be multiplied by a   
   > > matrix? I really need an example to see how this works. Any idea   
   > > where to find one?   
   > >   
   > > Michael   
   > >   
   >   
   > Yes, you can multiply any MxP matrix by any PxN matrix, with an MxN   
   > result.  You do it just as though the RH matrix were a row of column   
   > vectors next to each other.   
   >   
   > A*B = C   
      
   In which order must I multiply the matrices? Which is the input, A or B?   
      
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