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sspgst.f(3)				      LAPACK				      sspgst.f(3)

NAME
       sspgst.f -

SYNOPSIS
   Functions/Subroutines
       subroutine sspgst (ITYPE, UPLO, N, AP, BP, INFO)
	   SSPGST

Function/Subroutine Documentation
   subroutine sspgst (integerITYPE, characterUPLO, integerN, real, dimension( * )AP, real,
       dimension( * )BP, integerINFO)
       SSPGST

       Purpose:

	    SSPGST reduces a real symmetric-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**T)*A*inv(U) or inv(L)*A*inv(L**T)

	    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**T or L**T*A*L.

	    B must have been previously factorized as U**T*U or L*L**T by SPPTRF.

       Parameters:
	   ITYPE

		     ITYPE is INTEGER
		     = 1: compute inv(U**T)*A*inv(U) or inv(L)*A*inv(L**T);
		     = 2 or 3: compute U*A*U**T or L**T*A*L.

	   UPLO

		     UPLO is CHARACTER*1
		     = 'U':  Upper triangle of A is stored and B is factored as
			     U**T*U;
		     = 'L':  Lower triangle of A is stored and B is factored as
			     L*L**T.

	   N

		     N is INTEGER
		     The order of the matrices A and B.  N >= 0.

	   AP

		     AP is REAL array, dimension (N*(N+1)/2)
		     On entry, the upper or lower triangle of the symmetric 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

		     BP is REAL 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 SPPTRF.

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th argument had an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 114 of file sspgst.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      sspgst.f(3)
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