c Copyright (C) 2008 VZLU Prague, a.s., Czech Republic c c Author: Jaroslav Hajek <highegg@gmail.com> c c This file is part of OctGPR. c c OctGPR is free software; you can redistribute it and/or modify c it under the terms of the GNU General Public License as published by c the Free Software Foundation; either version 3 of the License, or c (at your option) any later version. c c This program is distributed in the hope that it will be useful, c but WITHOUT ANY WARRANTY; without even the implied warranty of c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the c GNU General Public License for more details. c c You should have received a copy of the GNU General Public License c along with this software; see the file COPYING. If not, see c <http://www.gnu.org/licenses/>. c subroutine dscsev(n,B,D,W,Z,info) c purpose: given a symmetric matrix B in packed storage, form the c eigendecomposition of diag(D)*B*diag(D) c arguments: c n (in) dimension of B c B (in) matrix in upper BLAS packed storage c D (in) scaling diagonal matrix c W (out) eigenvalues (as output by DSYEV) c Z (out) eigenvectors (as output by DSYEV) c integer n,info double precision B(*),D(n),W(n),Z(n,n) double precision work(3*n) integer i,j,k c form the scaled matrix diag(D)*B*diag(D) k = 0 do j = 1,n do i = 1,j k = k + 1 Z(i,j) = B(k) * D(i)*D(j) end do end do c get the polar decomposition (use unblocked code) call dsyev('V','U',n,Z,n,W,work,3*n,info) end subroutine

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