[Cg1] Re: 4x4 Matrix Cross Product

Arsène Pérard-Gayot perard at cg.uni-saarland.de
Wed Nov 25 18:07:14 CET 2015


The "cross product" obviously means the matrix-matrix product. See  
https://en.wikipedia.org/wiki/Matrix_multiplication. Be careful of the  
order of the operands (matrix-matrix multiplication is not  
commutative, unlike scalar multiplication).


Arsène Pérard-Gayot

Quoting Mohammad Shafiei <shafieirn at gmail.com>:

> Hello,
> I was wondering how should the corss product of two 4x4 matrix can be
> computed.
> There is an approach which considers two matrices as groups of vectors and
> applies cross product of two corresponding vectors. But in this approach
> still cross product of two 4d vectors is not defined!
> In the assignments, should we consider the last element as the scale factor
> and devide all other element of the vector by this factor? If this is the
> case, should we considers a matrix as a group of row vector or column?
> Kind Regards,
> Mohammad

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