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---
:name: chpgst
:md5sum: 1a890303b2501ebc28a37ce6b73eedd1
:category: :subroutine
:arguments:
- itype:
:type: integer
:intent: input
- uplo:
:type: char
:intent: input
- n:
:type: integer
:intent: input
- ap:
:type: complex
:intent: input/output
:dims:
- n*(n+1)/2
- bp:
:type: complex
:intent: input
:dims:
- n*(n+1)/2
- info:
:type: integer
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE CHPGST( ITYPE, UPLO, N, AP, BP, INFO )\n\n\
* Purpose\n\
* =======\n\
*\n\
* CHPGST reduces a complex Hermitian-definite generalized\n\
* eigenproblem to standard form, using packed storage.\n\
*\n\
* If ITYPE = 1, the problem is A*x = lambda*B*x,\n\
* and A is overwritten by inv(U**H)*A*inv(U) or inv(L)*A*inv(L**H)\n\
*\n\
* If ITYPE = 2 or 3, the problem is A*B*x = lambda*x or\n\
* B*A*x = lambda*x, and A is overwritten by U*A*U**H or L**H*A*L.\n\
*\n\
* B must have been previously factorized as U**H*U or L*L**H by CPPTRF.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* ITYPE (input) INTEGER\n\
* = 1: compute inv(U**H)*A*inv(U) or inv(L)*A*inv(L**H);\n\
* = 2 or 3: compute U*A*U**H or L**H*A*L.\n\
*\n\
* UPLO (input) CHARACTER*1\n\
* = 'U': Upper triangle of A is stored and B is factored as\n\
* U**H*U;\n\
* = 'L': Lower triangle of A is stored and B is factored as\n\
* L*L**H.\n\
*\n\
* N (input) INTEGER\n\
* The order of the matrices A and B. N >= 0.\n\
*\n\
* AP (input/output) COMPLEX array, dimension (N*(N+1)/2)\n\
* On entry, the upper or lower triangle of the Hermitian matrix\n\
* A, packed columnwise in a linear array. The j-th column of A\n\
* is stored in the array AP as follows:\n\
* if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;\n\
* if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.\n\
*\n\
* On exit, if INFO = 0, the transformed matrix, stored in the\n\
* same format as A.\n\
*\n\
* BP (input) COMPLEX array, dimension (N*(N+1)/2)\n\
* The triangular factor from the Cholesky factorization of B,\n\
* stored in the same format as A, as returned by CPPTRF.\n\
*\n\
* INFO (output) INTEGER\n\
* = 0: successful exit\n\
* < 0: if INFO = -i, the i-th argument had an illegal value\n\
*\n\n\
* =====================================================================\n\
*\n"
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