On Nov 1, 2007, at 10:36 AM, Daniel J Farrell wrote:
Hello,
Yes it will always be a 4x4. I have written a 'long hand' function in which I have written out the the determinant as its sequence of multiplications and additions.
How can I vectorise this? It has about 90+ terms?
In your experience would it we worth 90+ calls to vDSP_mul?
Gaussian elimination requires (n^3-n)/3 multiplications to get the matrix into upper triangular form (albeit with a some pivots, etc). Even for n=4 (where the number is 20), this should be much more efficient than the explicit formula.
