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lis_array_qr(3) Lis Library Functions lis_array_qr(3) NAME lis_array_qr - calculate the eigenvalues with the QR algorithm SYNOPSIS #include "lis.h" LIS_INT lis_array_qr(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR q[], LIS_SCALAR r[], LIS_INT *qriter, LIS_SCALAR *qrerr); DESCRIPTION Calculate the eigenvalues of matrix A with the QR algorithm. INPUT n The size of the matrices a The array that stores matrix A of size n * n q The work array Q of size n * n r The work array R of size n * n OUTPUT a The array that stores the block upper-triangular matrix with eigen- values in the block diagonal elements after similarity transforma- tion qriter The number of iterations of the QR algorithm qrerr The 2-norm of the first subdiagonal element A(2,1) after similarity transformation EXIT STATUS The following exit values are returned: 0 The process is normally terminated unspecified An error occurred SEE ALSO lis(3) http://www.ssisc.org/lis/ Man Page 1 Nov 2014 lis_array_qr(3)
NAME | SYNOPSIS | DESCRIPTION | INPUT | OUTPUT | EXIT STATUS | SEE ALSO
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