TESTING/EIG/dchkec.f(3)

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version 3.12.1 · 2 versions
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💖 TESTING/EIG/dchkec.f(3) 💖

Okay so this is the Library Functions Manual page for TESTING/EIG/dchkec.f(3) — welcome to the group chat, bestie. 🫶 This one is all about a Fortran test subroutine with main-character energy, and we're gonna walk through it together. No cap.

🌸 NAME 🌸

TESTING/EIG/dchkec.f

✨ SYNOPSIS ✨

🎀 Functions/Subroutines 🎀

subroutine dchkec (thresh, tsterr, nin, nout)
    DCHKEC

💅 Function/Subroutine Documentation 💅

🦋 subroutine dchkec 🦋

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

DCHKEC

🌟 Purpose 🌟

DCHKEC tests eigen-condition estimation routines: DLALN2, DLASY2, DLANV2, DLAQTR, DLAEXC, DTRSYL, DTREXC, DTRSNA, DTRSEN, DTGEXC. ✨

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, DTREXC, DTRSNA, and DTRSEN are tested by reading in precomputed examples from a file (on input unit NIN). Output is written to output unit NOUT. 💾

🎀 Parameters 🎀

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

👑 Author 👑

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

📍 Definition at line 75 of file dchkec.f.

🌈 Author 🌈

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