TESTING/LIN/cchksy.f(3)

💅 TESTING/LIN/cchksy.f — like, the whole entire vibe

okay so bestie, buckle up 🎀 this is the manual page for TESTING/LIN/cchksy.f, from the LAPACK library functions manual. it's a Fortran file, it tests things, and it's genuinely iconic. let's get into it ✨

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✨ SYNOPSIS — Functions/Subroutines ✨

there's exactly one function here, and she's the main character 👑:

subroutine cchksy (dotype, nn, nval, nnb, nbval, nns, nsval, thresh,
    tsterr, nmax, a, afac, ainv, b, x, xact, work, rwork, iwork, nout)

and yeah — CCHKSY. that's her name. that's the whole listing. 💜

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🦋 Function/Subroutine Documentation 🦋

the full signature, in all her glory 🌸

subroutine cchksy (logical, dimension( * ) dotype, integer nn, integer,
    dimension( * ) nval, integer nnb, integer, dimension( * ) nbval, integer
    nns, integer, dimension( * ) nsval, real thresh, logical tsterr, integer
    nmax, complex, dimension( * ) a, complex, dimension( * ) afac, complex,
    dimension( * ) ainv, complex, dimension( * ) b, complex, dimension( * )
    x, complex, dimension( * ) xact, complex, dimension( * ) work, real,
    dimension( * ) rwork, integer, dimension( * ) iwork, integer nout)

CCHKSY

🎯 Purpose

CCHKSY tests CSYTRF, -TRI2, -TRS, -TRS2, -RFS, and -CON.

that's it. that's the mission statement. she runs the whole gauntlet on those routines, no cap 🔥

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🌈 Parameters 🌈

lowkey the longest part but literally every single one matters, so here we go, one by one, no skipping 🫶

• DOTYPE — DOTYPE is LOGICAL array, dimension (NTYPES). it's the matrix types to be used for testing, fr fr. matrices of type j (for 1 <= j <= NTYPES) get used for testing if DOTYPE(j) = .TRUE.; if DOTYPE(j) = .FALSE., then type j is just not used. that's the whole system 💅
• NN — NN is INTEGER. it's the number of values of N contained in the vector NVAL. so like, how many sizes we're testing ✨
• NVAL — NVAL is INTEGER array, dimension (NN). these are the values of the matrix dimension N. the actual sizes, bestie 📏
• NNB — NNB is INTEGER. the number of values of NB contained in the vector NBVAL.
• NBVAL — NBVAL is INTEGER array, dimension (NNB). the values of the blocksize NB. block sizes matter, iykyk 🧱
• NNS — NNS is INTEGER. the number of values of NRHS contained in the vector NSVAL.
• NSVAL — NSVAL is INTEGER array, dimension (NNS). the values of the number of right hand sides NRHS. it's giving "how many RHS are we throwing at this" energy 💀
• THRESH — THRESH is REAL. the threshold value for the test ratios. here's the tea: a result is included in the output file if RESULT >= THRESH. and if you want every single test ratio printed? use THRESH = 0. periodt 👑
• TSTERR — TSTERR is LOGICAL. flag that indicates whether error exits are to be tested. yeet the errors at it or don't, your call 🚩
• NMAX — NMAX is INTEGER. the maximum value permitted for N, used in dimensioning the work arrays. she's the ceiling, the limit, the whole vibe check for array sizing 🎀
• A — A is COMPLEX array, dimension (NMAX*NMAX). the matrix herself 💖
• AFAC — AFAC is COMPLEX array, dimension (NMAX*NMAX). the factored version, obsessed 🔥
• AINV — AINV is COMPLEX array, dimension (NMAX*NMAX). the inverse. iconic behavior 🌟
• B — B is COMPLEX array, dimension (NMAX*NSMAX), where NSMAX is the largest entry in NSVAL. right hand side bestie 🫶
• X — X is COMPLEX array, dimension (NMAX*NSMAX). the solution zone ✨
• XACT — XACT is COMPLEX array, dimension (NMAX*NSMAX). the exact solution, for comparison purposes, natch 💅
• WORK — WORK is COMPLEX array, dimension (NMAX*max(2,NSMAX)). scratch space, she works hard so the others don't have to 🧚
• RWORK — RWORK is REAL array, dimension (NMAX+2*NSMAX). real-valued scratch space, keeping it grounded 🌸
• IWORK — IWORK is INTEGER array, dimension (NMAX). integer scratch space, tiny but mighty 🌈
• NOUT — NOUT is INTEGER. the unit number for output. that's where all the results go, so like, the printer but make it Fortran 🖨️

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👑 Author 👑

the legends behind this:

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

absolute icons, every one of them 🫡💜

quick note bestie: Definition at line 168 of file cchksy.f. — that's where she lives in the source. 📍

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🎀 Author (yes, again, but different) 🎀

this bit says: generated automatically by Doxygen for LAPACK from the source code. so like, nobody hand-wrote this page, the machine did it. still slay though 🤖✨

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💖 cute lil sign-off 💖

and that's the whole page! this beauty is LAPACK, Version 3.12.0, and she's chillin' at TESTING/LIN/cchksy.f(3). go forth and test those complex symmetric matrices, bestie — you got this 🦋🌟💜