Non-direct method
2.2.1. Gauss elimination method
The method used in programming is usually the Gauss method. In this method, matrices are sorted to semitriangle
matrices, and the value of the determinant is the multiplication of the pivot arrays. However, there are
no guassantes that all of matrices could be changed to a semi-triangle matrix. The semi-triangulization itself
consumes quite a long time after understanding the technique used. In this method the number of calculating
operations is related to the size of matrices which equal (N ^ 3)/3.