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det - Matrix determinant
float det( float[][] $m )
det() returns the determinant of matrix m.
m - The matrix. It can be a single two-dimensional array or an array of two-dimensional arrays. It must be a square matrix.
Determinant of m. If m contains multiple matrices, the return value will be an array.
1.0 and above. Prior to version 2.0, det() only accepts 2x2, 3x3, and 4x4 matrices.