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NAME
     dpotrs - solve a system of linear equations A*X = B  with  a
     symmetric positive definite matrix A using the Cholesky fac-
     torization A = U**T*U or A = L*L**T computed by DPOTRF

SYNOPSIS
     SUBROUTINE DPOTRS( UPLO, N, NRHS, A, LDA, B, LDB, INFO )

     CHARACTER UPLO

     INTEGER INFO, LDA, LDB, N, NRHS

     DOUBLE PRECISION A( LDA, * ), B( LDB, * )



     #include <sunperf.h>

     void dpotrs(char uplo, int n, int nrhs, double *da, int lda,
               double *db, int ldb, int *info) ;

PURPOSE
     DPOTRS solves a system of linear equations A*X =  B  with  a
     symmetric positive definite matrix A using the Cholesky fac-
     torization A = U**T*U or A = L*L**T computed by DPOTRF.


ARGUMENTS
     UPLO      (input) CHARACTER*1
               = 'U':  Upper triangle of A is stored;
               = 'L':  Lower triangle of A is stored.

     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.

     A         (input) DOUBLE PRECISION array, dimension (LDA,N)
               The triangular factor U or  L  from  the  Cholesky
               factorization  A  =  U**T*U or A = L*L**T, as com-
               puted by DPOTRF.

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

     B         (input/output) DOUBLE PRECISION  array,  dimension
               (LDB,NRHS)
               On entry, the right hand side matrix B.  On  exit,
               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 ille-
               gal value

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