TESTING/EIG/slctes.f(3)

💖 NAME 💖

TESTING/EIG/slctes.f

Okay bestie, welcome to the Library Functions Manual page for TESTING/EIG/slctes.f(3). It’s the Fortran function SLCTES, and it’s lowkey doing eigenvalue-selection checks for the test suite. 💅

✨ SYNOPSIS ✨

Functions/Subroutines

• logical function slctes (zr, zi, d) — SLCTES

🌸 Function/Subroutine Documentation 🌸

logical function slctes (real zr, real zi, real d)

SLCTES

Purpose:

SLCTES returns .TRUE. if the eigenvalue (ZR/D) + sqrt(-1)*(ZI/D) is to be selected (specifically, in this subroutine, if the real part of the eigenvalue is negative), and otherwise it returns .FALSE..

It is used by the test routine SDRGES to test whether the driver routine SGGES successfully sorts eigenvalues. No cap, that’s the whole job. 🦋

Parameters

• ZR — ZR is REAL. The numerator of the real part of a complex eigenvalue (ZR/D) + i*(ZI/D).
• ZI — ZI is REAL. The numerator of the imaginary part of a complex eigenvalue (ZR/D) + i*(ZI).
• D — D is REAL. The denominator part of a complex eigenvalue (ZR/D) + i*(ZI/D).

Author

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

Definition at line 67 of file slctes.f.

👑 Author 👑

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