TESTING/EIG/zchkec.f(3)

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🎀 TESTING/EIG/zchkec.f 🎀

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📛 NAME 📛

TESTING/EIG/zchkec.f

✨ SYNOPSIS ✨

🧚 Functions/Subroutines

subroutine zchkec (thresh, tsterr, nin, nout)
    ZCHKEC

🛠️ Function/Subroutine Documentation 🛠️

subroutine zchkec (double precision thresh, logical tsterr, integer nin,
    integer nout)
    ZCHKEC

This is the ZCHKEC routine, and it is literally the main character here. 👑

🎯 Purpose

ZCHKEC tests eigen- condition estimation routines ZTRSYL, CTREXC, CTRSNA, and CTRSEN. (Yes, the original says “eigen- condition” with that little gap — keeping the facts exactly as they are, bestie. 🫶)

In all cases, the routine runs through a fixed set of numerical examples, subjects them to various tests, and compares the test results to a threshold THRESH. In addition, ZTRSNA and CTRSEN are tested by reading in precomputed examples from a file (on input unit NIN). Output is written to output unit NOUT.

🧾 Parameters

  • THRESH — DOUBLE PRECISION. Threshold for residual tests. A computed test ratio passes the threshold if it is less than THRESH.
  • TSTERR — LOGICAL. Flag that indicates whether error exits are to be tested.
  • NIN — INTEGER. The logical unit number for input.
  • NOUT — INTEGER. The logical unit number for output.

👑 Author 👑

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

Definition at line 74 of file zchkec.f.

🫶 Author 🫶

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