DPPTRS(3)

💅 DPPTRS(3) — Library Functions Manual ✨

okay bestie, gather round: this is the page for DPPTRS(3), and it's lowkey iconic if you're doing packed symmetric-positive-definite linear solves. No cap, every parameter is below, nothing skipped. 🫶

🎀 NAME 🎀

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/SRC/dpptrs.f

✨ SYNOPSIS ✨

🦋 Functions/Subroutines 🦋

subroutine DPPTRS (uplo, n, nrhs, ap, b, ldb, info)
    DPPTRS

💖 Function/Subroutine Documentation 💖

subroutine DPPTRS (character uplo, integer n, integer nrhs, double precision, dimension( * ) ap, double precision, dimension( ldb, * ) b, integer ldb, integer info)

DPPTRS

🌸 Purpose 🌸

DPPTRS solves a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky factorization A = U**T*U or A = L*L**T computed by DPPTRF. Periodt. 🔥

🎀 Parameters 🎀

• UPLO — CHARACTER*1. = 'U': upper triangle of A is stored; = 'L': lower triangle of A is stored. 💅
• N — INTEGER. The order of the matrix A. N >= 0.
• NRHS — INTEGER. The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.
• AP — DOUBLE PRECISION array, dimension (N*(N+1)/2). The triangular factor U or L from the Cholesky factorization A = U**T*U or A = L*L**T, packed columnwise in a linear array. The j-th column of U or L is stored in the array AP as follows:

if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;
if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

• B — DOUBLE PRECISION array, dimension (LDB,NRHS). On entry, the right hand side matrix B. On exit, the solution matrix X. ✨
• LDB — INTEGER. The leading dimension of the array B. LDB >= max(1,N).
• INFO — 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.

Definition at line 107 of file dpptrs.f.

💜 Author 💜

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

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