- #1
ManishR
- 88
- 0
lets assume matrix A = [a]mxn and B = nxp
[tex](AB)_{ij}=\sum_{r=1}^{n}A_{ir}B_{rj}[/tex]
why is that ?
i guessed it would be
[tex](AB)_{ij}=\sum_{r=1}^{n}A_{ir}B_{jr}[/tex] where m=p.
so is there any logic behind that or its just random ?
[tex](AB)_{ij}=\sum_{r=1}^{n}A_{ir}B_{rj}[/tex]
why is that ?
i guessed it would be
[tex](AB)_{ij}=\sum_{r=1}^{n}A_{ir}B_{jr}[/tex] where m=p.
so is there any logic behind that or its just random ?