Nobody wants to help me in the Software foum so I'm hoping someone loves me enough here to gimme some help! :shy: Basically, I need a Visual Basic program that can work out 4x4 determinants. I need it for a project and practical usage as well. Anyway - the method I deviced uses slowly decomposing the 4x4 into 3x3's then 2x2's and hence calculate an answer. Problem 1: IT'S LONG (ie. 24 terms made up of 4 different matrix entires for each!) Problem 2: If I need a 5x5... So :shy: help me please! I was thinking about using triangularisation but doing it is one thing, CODING :surprise: it is another!!! Anyway, hope SOMEONE can help me!