ZGET04(3)

📦 version 3.12.0, in opensuse-leap 16.0

okay bestie, this is ZGET04(3), straight from the Library Functions Manual — yes, the manual name got folded in near the top like a little name tag. 🫶

💖 NAME 💖

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/zget04.f

that’s it. that’s the NAME. iconic file-path energy 💅

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

       subroutine ZGET04 (n, nrhs, x, ldx, xact, ldxact, rcond, resid)
           ZGET04

the short version of the call is right here, no cap.

🌸 Function/Subroutine Documentation 🌸

   subroutine ZGET04 (integer n, integer nrhs, complex*16, dimension( ldx, * )
       x, integer ldx, complex*16, dimension( ldxact, * ) xact, integer ldxact,
       double precision rcond, double precision resid)
       ZGET04

so this is the full signature, and the line under it is literally ZGET04 again. 💖

🦋 Purpose 🦋

ZGET04 computes the difference between a computed solution and the true solution to a system of linear equations. it’s giving “how far off is my answer?” realness.

RESID = ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS ),

where RCOND is the reciprocal of the condition number and EPS is the machine epsilon. slay.

💅 Parameters 💅

  • N — N is INTEGER. The number of rows of the matrices X and XACT. N >= 0.
  • NRHS — NRHS is INTEGER. The number of columns of the matrices X and XACT. NRHS >= 0.
  • X — X is COMPLEX*16 array, dimension (LDX,NRHS). The computed solution vectors. Each vector is stored as a column of the matrix X.
  • LDX — LDX is INTEGER. The leading dimension of the array X. LDX >= max(1,N).
  • XACT — XACT is COMPLEX*16 array, dimension (LDX,NRHS). The exact solution vectors. Each vector is stored as a column of the matrix XACT.
  • LDXACT — LDXACT is INTEGER. The leading dimension of the array XACT. LDXACT >= max(1,N).
  • RCOND — RCOND is DOUBLE PRECISION. The reciprocal of the condition number of the coefficient matrix in the system of equations.
  • RESID — RESID is DOUBLE PRECISION. The maximum over the NRHS solution vectors of ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS ).

👑 Author 👑

  • Univ. of Tennessee
  • Univ. of California Berkeley
  • Univ. of Colorado Denver
  • NAG Ltd.

Definition at line 101 of file zget04.f.

💜 Author 💜

Generated automatically by Doxygen for LAPACK from the source code.

and that’s the whole page, bestie. footer vibe check: LAPACK, Version 3.12.0, and the footer path /home/abui...IN/zget04.f(3) — slay your residual checks and stay iconic 💅✨

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