TESTING/EIG/dckcsd.f(3)

🎀 TESTING/EIG/dckcsd.f(3) 🎀

Library Functions Manual — okay bestie, welcome to the LAPACK testing-page era, it’s giving very specific and very iconic 💖

💖 NAME 💖

TESTING/EIG/dckcsd.f

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✨ SYNOPSIS ✨

🫶 Functions/Subroutines 🫶

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

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💫 Function/Subroutine Documentation 💫

🌸 subroutine dckcsd 🌸

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

DCKCSD

🦋 Purpose 🦋

So, DCKCSD tests DORCSD: the CSD for an M-by-M orthogonal matrix X partitioned as [ X11 X12; X21 X22 ]. X11 is P-by-Q. That’s the whole vibe of it, no cap 💅

🎀 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.
• THRESH — THRESH is DOUBLE PRECISION. 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 DOUBLE PRECISION array, dimension (MMAX*MMAX).
• XF — XF is DOUBLE PRECISION array, dimension (MMAX*MMAX).
• U1 — U1 is DOUBLE PRECISION array, dimension (MMAX*MMAX).
• U2 — U2 is DOUBLE PRECISION array, dimension (MMAX*MMAX).
• V1T — V1T is DOUBLE PRECISION array, dimension (MMAX*MMAX).
• V2T — V2T is DOUBLE PRECISION array, dimension (MMAX*MMAX).
• THETA — THETA is DOUBLE PRECISION array, dimension (MMAX).
• IWORK — IWORK is INTEGER array, dimension (MMAX).
• WORK — WORK is DOUBLE PRECISION array.
• RWORK — RWORK is DOUBLE PRECISION array.
• NIN — NIN is INTEGER. The unit number for input.
• NOUT — NOUT is INTEGER. The unit number for output.
• INFO — INFO is INTEGER. = 0 : successful exit. > 0 : If DLAROR 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 dckcsd.f.

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🦋 subroutine dlacsg 🦋

subroutine dlacsg (integer m, integer p, integer q, double precision,
    dimension( * ) theta, integer, dimension( 4 ) iseed, double precision,
    dimension( ldx, * ) x, integer ldx, double precision, dimension( * )
    work)

Definition at line 350 of file dckcsd.f.

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🌟 Author 🌟

Generated automatically by Doxygen for LAPACK from the source code.

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💖 Cute little sign-off, bestie: the footer vibes are LAPACK, Version 3.12.0, and this page is TESTING/EIG/dckcsd.f(3). Periodt 🎀✨