TESTING/EIG/sckcsd.f(3)

💅 TESTING/EIG/sckcsd.f ✨

okay bestie, welcome to TESTING/EIG/sckcsd.f, straight out of the LAPACK manual (Doxygen-generated, obviously) — this is the level-3 test-suite energy and honestly? iconic. 🎀

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🌸 SYNOPSIS 🌸

Functions/Subroutines

• subroutine sckcsd (nm, mval, pval, qval, nmats, iseed, thresh, mmax, x, xf, u1, u2, v1t, v2t, theta, iwork, work, rwork, nin, nout, info) — SCKCSD 💖
• subroutine slacsg (m, p, q, theta, iseed, x, ldx, work)

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🦋 Function/Subroutine Documentation 🦋

✨ subroutine sckcsd ✨

subroutine sckcsd (integer nm, integer, dimension( * ) mval, integer,
    dimension( * ) pval, integer, dimension( * ) qval, integer nmats,
    integer, dimension( 4 ) iseed, real thresh, integer mmax, real,
    dimension( * ) x, real, dimension( * ) xf, real, dimension( * ) u1,
    real, dimension( * ) u2, real, dimension( * ) v1t, real, dimension( * )
    v2t, real, dimension( * ) theta, integer, dimension( * ) iwork, real,
    dimension( * ) work, real, dimension( * ) rwork, integer nin, integer
    nout, integer info)

SCKCSD 🫶

🍓 Purpose 🍓

SCKCSD tests SORCSD: the CSD for an M-by-M orthogonal matrix X partitioned as [ X11 X12; X21 X22 ]. X11 is P-by-Q.

literally the whole vibe: it's the vibe check for SORCSD. 💅

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🌈 Parameters 🌈

• NM — NM is INTEGER. The number of values of M contained in the vector MVAL. 🔢
• MVAL — MVAL is INTEGER array, dimension (NM). The values of the matrix row dimension M. 📏
• PVAL — PVAL is INTEGER array, dimension (NM). The values of the matrix row dimension P. 📐
• QVAL — QVAL is INTEGER array, dimension (NM). The values of the matrix column dimension Q. 📎
• NMATS — NMATS is INTEGER. The number of matrix types to be tested for each combination of matrix dimensions. If NMATS >= NTYPES (the maximum number of matrix types), then all the different types are generated for testing. If NMATS < NTYPES, another input line is read to get the numbers of the matrix types to be used. 🧮
• ISEED — ISEED is INTEGER array, dimension (4). On entry, the seed of the random number generator. The array elements should be between 0 and 4095, otherwise they will be reduced mod 4096, and ISEED(4) must be odd. On exit, the next seed in the random number sequence after all the test matrices have been generated. 🎲 (yes bestie, ISEED(4) must be odd — that's not a suggestion 💀)
• THRESH — THRESH is REAL. The threshold value for the test ratios. A result is included in the output file if RESULT >= THRESH. To have every test ratio printed, use THRESH = 0. 🚨
• MMAX — MMAX is INTEGER. The maximum value permitted for M, used in dimensioning the work arrays. 📦
• X — X is REAL array, dimension (MMAX*MMAX) 🧊
• XF — XF is REAL array, dimension (MMAX*MMAX) 🧊
• U1 — U1 is REAL array, dimension (MMAX*MMAX) 🧊
• U2 — U2 is REAL array, dimension (MMAX*MMAX) 🧊
• V1T — V1T is REAL array, dimension (MMAX*MMAX) 🧊
• V2T — V2T is REAL array, dimension (MMAX*MMAX) 🧊
• THETA — THETA is REAL array, dimension (MMAX) 🔺
• IWORK — IWORK is INTEGER array, dimension (MMAX) 🔧
• WORK — WORK is REAL array 🛠️
• RWORK — RWORK is REAL array 🛠️
• NIN — NIN is INTEGER. The unit number for input. ⌨️
• NOUT — NOUT is INTEGER. The unit number for output. 🖨️
• INFO — INFO is INTEGER. Exit status, and it's giving very specific:
  • = 0 : successful exit ✅
  • > 0 : If SLAROR returns an error code, the absolute value of it is returned. 😭

👑 Author 👑

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

Definition at line 181 of file sckcsd.f. 📍

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🧚 subroutine slacsg 🧚

subroutine slacsg (integer m, integer p, integer q, real, dimension( * )
    theta, integer, dimension( 4 ) iseed, real, dimension( ldx, * ) x,
    integer ldx, real, dimension( * ) work)

Definition at line 349 of file sckcsd.f. 📍

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⭐ Author ⭐

Generated automatically by Doxygen for LAPACK from the source code. 🤖✨

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LAPACK · Version 3.12.0 · TESTING/EIG/sckcsd.f(3)

and that's the whole page bestie, no cap 💖 go forth and test those CSD routines, slay 🫶🎀