TESTING/EIG/dsxt1.f(3)

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💅 TESTING/EIG/dsxt1.f 💅

okay bestie, this is the Library Functions Manual page for TESTING/EIG/dsxt1.f — yes, that exact file, no cap. This page is all about dsxt1, and she's lowkey iconic for computing eigenvalue differences. ✨

🌸 NAME 🌸

TESTING/EIG/dsxt1.f

🦋 SYNOPSIS 🦋

Functions/Subroutines

  • double precision function dsxt1 (ijob, d1, n1, d2, n2, abstol, ulp, unfl) — DSXT1

✨ Function/Subroutine Documentation ✨

double precision function dsxt1 (integer ijob, double precision, dimension( * ) d1, integer n1, double precision, dimension( * ) d2, integer n2, double precision abstol, double precision ulp, double precision unfl)

DSXT1 💖

🎀 Purpose 🎀

okay so DSXT1 computes the difference between a set of eigenvalues. The result is returned as the function value. periodt. 💫

IJOB = 1:   Computes   max { min | D1(i)-D2(j) | }
                        i     j

IJOB = 2:   Computes   max { min | D1(i)-D2(j) | /
                        i     j
                             ( ABSTOL + |D1(i)|*ULP ) }

🍓 Parameters 🍓

  • IJOB — IJOB is INTEGER. Specifies the type of tests to be performed. (See above.) 👀
  • D1 — D1 is DOUBLE PRECISION array, dimension (N1). The first array. D1 should be in increasing order, i.e., D1(j) <= D1(j+1). 🦋
  • N1 — N1 is INTEGER. The length of D1. ✨
  • D2 — D2 is DOUBLE PRECISION array, dimension (N2). The second array. D2 should be in increasing order, i.e., D2(j) <= D2(j+1). 💜
  • N2 — N2 is INTEGER. The length of D2. 🌈
  • ABSTOL — ABSTOL is DOUBLE PRECISION. The absolute tolerance, used as a measure of the error. 🎯
  • ULP — ULP is DOUBLE PRECISION. Machine precision. 🧚
  • UNFL — UNFL is DOUBLE PRECISION. The smallest positive number whose reciprocal does not overflow. 🔥

👑 Author 👑

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

Definition at line 104 of file dsxt1.f. 📌

🧚 Author 🧚

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mwah 💋 — this iconic little page is signed off with LAPACK Version 3.12.0 and the path TESTING/EIG/dsxt1.f(3). And if you're looking for a date on this footer, bestie, there literally isn't one here. 🙈💖

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