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firebirdta you've made a few typos, the last column in A*D should be:
[ai + bl, ci + dl, ei + fl]
essendoubleop: How familiar are you with dot products?
The first entry of A*D (upper left) is the dot product of the first row in A with the first column in D.
The second entry (upper middle) is the dot product of the first row of A with the second column in D.
The third entry (upper right) is the dot product of the first row of A with the third column of D
The fourth entry (bottom left) is the dot product of the second row of A with the first column of D.
et cetera.
Does that help you?
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