Use the DET function to find the determinant of a matrix. If no argument is given, DET returns the determinant of the most recently inverted matrix. Zero is returned if no matrix has been inverted since start-up, SCRATCH or SCRATCH A. If the determinant of a matrix is zero, the matrix does not have a valid inverse. If a very small value is returned compared to the matrix elements, this may imply the matrix cannot accurately be inverted by computer methods.
