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---
:name: spptrs
:md5sum: 87799d8280769b5abe7f899985cf3927
:category: :subroutine
:arguments:
- uplo:
:type: char
:intent: input
- n:
:type: integer
:intent: input
- nrhs:
:type: integer
:intent: input
- ap:
:type: real
:intent: input
:dims:
- n*(n+1)/2
- b:
:type: real
:intent: input/output
:dims:
- ldb
- nrhs
- ldb:
:type: integer
:intent: input
- info:
:type: integer
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE SPPTRS( UPLO, N, NRHS, AP, B, LDB, INFO )\n\n\
* Purpose\n\
* =======\n\
*\n\
* SPPTRS solves a system of linear equations A*X = B with a symmetric\n\
* positive definite matrix A in packed storage using the Cholesky\n\
* factorization A = U**T*U or A = L*L**T computed by SPPTRF.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* UPLO (input) CHARACTER*1\n\
* = 'U': Upper triangle of A is stored;\n\
* = 'L': Lower triangle of A is stored.\n\
*\n\
* N (input) INTEGER\n\
* The order of the matrix A. N >= 0.\n\
*\n\
* NRHS (input) INTEGER\n\
* The number of right hand sides, i.e., the number of columns\n\
* of the matrix B. NRHS >= 0.\n\
*\n\
* AP (input) REAL array, dimension (N*(N+1)/2)\n\
* The triangular factor U or L from the Cholesky factorization\n\
* A = U**T*U or A = L*L**T, packed columnwise in a linear\n\
* array. The j-th column of U or L is stored in the array AP\n\
* as follows:\n\
* if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;\n\
* if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.\n\
*\n\
* B (input/output) REAL array, dimension (LDB,NRHS)\n\
* On entry, the right hand side matrix B.\n\
* On exit, the solution matrix X.\n\
*\n\
* LDB (input) INTEGER\n\
* The leading dimension of the array B. LDB >= max(1,N).\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\
* .. Local Scalars ..\n LOGICAL UPPER\n INTEGER I\n\
* ..\n\
* .. External Functions ..\n LOGICAL LSAME\n EXTERNAL LSAME\n\
* ..\n\
* .. External Subroutines ..\n EXTERNAL STPSV, XERBLA\n\
* ..\n\
* .. Intrinsic Functions ..\n INTRINSIC MAX\n\
* ..\n"
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