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CTPTRS(l)			       )			     CTPTRS(l)

NAME
       CTPTRS  -  solve a triangular system of the form	 A * X = B, A**T * X =
       B, or A**H * X = B,

SYNOPSIS
       SUBROUTINE CTPTRS( UPLO, TRANS, DIAG, N, NRHS, AP, B, LDB, INFO )

	   CHARACTER	  DIAG, TRANS, UPLO

	   INTEGER	  INFO, LDB, N, NRHS

	   COMPLEX	  AP( * ), B( LDB, * )

PURPOSE
       CTPTRS solves a triangular system of the form A * X = B, A**T * X =  B,
       or  A**H	 *  X = B, where A is a triangular matrix of order N stored in
       packed format, and B is an N-by-NRHS matrix.  A check is made to verify
       that A is nonsingular.

ARGUMENTS
       UPLO    (input) CHARACTER*1
	       = 'U':  A is upper triangular;
	       = 'L':  A is lower triangular.

       TRANS   (input) CHARACTER*1
	       Specifies the form of the system of equations:
	       = 'N':  A * X = B     (No transpose)
	       = 'T':  A**T * X = B  (Transpose)
	       = 'C':  A**H * X = B  (Conjugate transpose)

       DIAG    (input) CHARACTER*1
	       = 'N':  A is non-unit triangular;
	       = 'U':  A is unit triangular.

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       NRHS    (input) INTEGER
	       The  number of right hand sides, i.e., the number of columns of
	       the matrix B.  NRHS >= 0.

       AP      (input) COMPLEX array, dimension (N*(N+1)/2)
	       The upper or lower triangular 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)*(2*n-j)/2) = A(i,j) for
	       j<=i<=n.

       B       (input/output) COMPLEX array, dimension (LDB,NRHS)
	       On entry, the right hand side matrix B.	On exit, if INFO =  0,
	       the solution matrix X.

       LDB     (input) INTEGER
	       The leading dimension of the array B.  LDB >= max(1,N).

       INFO    (output) INTEGER
	       = 0:  successful exit
	       < 0:  if INFO = -i, the i-th argument had an illegal value
	       >  0:   if  INFO	 =  i, the i-th diagonal element of A is zero,
	       indicating that the matrix is singular and the solutions X have
	       not been computed.

LAPACK version 3.0		 15 June 2000			     CTPTRS(l)
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