CHPGST - Online Linux Manual PageSection : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)

NAMECHPGST - reduces a complex Hermitian-definite generalized eigenproblem to standard form, using packed storage

SYNOPSISSUBROUTINE CHPGST(  ITYPE, UPLO, N, AP, BP, INFO )  CHARACTER UPLO  INTEGER INFO, ITYPE, N  COMPLEX AP( * ), BP( * )

PURPOSECHPGST reduces a complex Hermitian-definite generalized eigenproblem to standard form, using packed storage. If ITYPE = 1, the problem is A*x = lambda*B*x,
and A is overwritten by inv(U**H)*A*inv(U) or inv(L)*A*inv(L**H) If ITYPE = 2 or 3, the problem is A*B*x = lambda*x or
B*A*x = lambda*x, and A is overwritten by U*A*U**H or L**H*A*L. B must have been previously factorized as U**H*U or L*L**H by CPPTRF.

ARGUMENTSITYPE (input) INTEGER  = 1: compute inv(U**H)*A*inv(U) or inv(L)*A*inv(L**H);
= 2 or 3: compute U*A*U**H or L**H*A*L.
UPLO (input) CHARACTER*1  
= 'U': Upper triangle of A is stored and B is factored as U**H*U; = 'L': Lower triangle of A is stored and B is factored as L*L**H.
N (input) INTEGER  The order of the matrices A and B. N >= 0. AP (input/output) COMPLEX array, dimension (N*(N+1)/2)  On entry, the upper or lower triangle of the Hermitian matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array AP as follows: if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n. On exit, if INFO = 0, the transformed matrix, stored in the same format as A. BP (input) COMPLEX array, dimension (N*(N+1)/2)  The triangular factor from the Cholesky factorization of B, stored in the same format as A, as returned by CPPTRF. INFO (output) INTEGER  = 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
0
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