DGET04(3)

🌸 NAME 🌸

okay so welcome to the DGET04(3) page, bestie — you’re in the Library Functions Manual and this one is literally all about the file path below. slay.

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dget04.f

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✨ SYNOPSIS ✨

🎀 Functions/Subroutines

   subroutine DGET04 (n, nrhs, x, ldx, xact, ldxact, rcond, resid)
           DGET04

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💖 Function/Subroutine Documentation 💖

here’s the full signature, no cap:

   subroutine DGET04 (integer n, integer nrhs, double precision, dimension(
       ldx, * ) x, integer ldx, double precision, dimension( ldxact, * ) xact,
       integer ldxact, double precision rcond, double precision resid)
       DGET04

🎯 Purpose 🎯

so DGET04 computes the difference between a computed solution and the true solution to a system of linear equations. iconic behavior fr fr.

the formula is:

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

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

🧸 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 DOUBLE PRECISION 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 DOUBLE PRECISION 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.

🤖 Author 🤖

Generated automatically by Doxygen for LAPACK from the source code. yes bestie, the robots did this one. 🫡

📌 Definition at line 101 of file dget04.f. 📌

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mwah 💋 signing off from LAPACK Version 3.12.0, source /home/abui...IN/dget04.f(3). periodt. 🌈💜