Re:

[Ozzy Lash]

You are trying to multiply a 2x3 matrix by another 2x3 matrix.  The page that you point to multiplies a 2x3 by a 3x2 which is allowable.

>> A=[1,2,3;4,5,6];
>> B=[7,8;9,10;11,12];
>> A*B
ans =

    58    64
   139   154

Note if you print the A and B matrices you'll see:
>> A
A =

   1   2   3
   4   5   6

>> B
B =

    7    8
    9   10
   11   12

On Sun, Oct 25, 2015 at 12:52 AM, Jonathan Camilleri <address@hidden> wrote:

Just for info, I sent this to the authors of http://www.mathsisfun.com/, as the tutorial at http://www.mathsisfun.com/algebra/matrix-multiplying.html, does not seem to provide the right example, based also on feedback from members of this group.

>> A = [1,2,3; 4,5,6];

>> B = [7,9,11;8,10,12];

>> C = A*B;

error: operator *: nonconformant arguments (op1 is 2x3, op2 is 2x3)

I do not have a mathematical proof so I have to question at this stage.

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