TESTING/LIN/ddrvls.f(3)

okay bestie, welcome to TESTING/LIN/ddrvls.f(3) from the Library Functions Manual — this is the page for DDRVLS, and it’s giving “least-squares driver test central” 💖

NAME

TESTING/LIN/ddrvls.f — literally the source file name, that’s the whole NAME section, no cap 🎀

✨ SYNOPSIS ✨

Functions/Subroutines 🧚

subroutine ddrvls (dotype, nm, mval, nn, nval, nns, nsval, nnb, nbval,
     nxval, thresh, tsterr, a, copya, b, copyb, c, s, copys, nout)
     DDRVLS

💅 Function/Subroutine Documentation 💅

subroutine ddrvls 🫶

Here’s the whole signature, verbatim, because we do not play with technical details:

subroutine ddrvls (logical, dimension( * ) dotype, integer nm, integer,
     dimension( * ) mval, integer nn, integer, dimension( * ) nval, integer
     nns, integer, dimension( * ) nsval, integer nnb, integer, dimension( * )
     nbval, integer, dimension( * ) nxval, double precision thresh, logical
     tsterr, double precision, dimension( * ) a, double precision, dimension(
     * ) copya, double precision, dimension( * ) b, double precision,
     dimension( * ) copyb, double precision, dimension( * ) c, double
     precision, dimension( * ) s, double precision, dimension( * ) copys,
     integer nout)
     DDRVLS

🎯 Purpose

DDRVLS tests the least squares driver routines DGELS, DGELST, DGETSLS, DGELSS, DGELSY, and DGELSD. That’s the assignment, periodt ✨

🌸 Parameters

• DOTYPE — DOTYPE is LOGICAL array, dimension (NTYPES). The matrix types to be used for testing. Matrices of type j (for 1 <= j <= NTYPES) are used for testing if DOTYPE(j) = .TRUE.; if DOTYPE(j) = .FALSE., then type j is not used. The matrix of type j is generated as follows:
  • j=1: A = U*D*V where U and V are random orthogonal matrices and D has random entries (> 0.1) taken from a uniform distribution (0,1). A is full rank.
  • j=2: The same of 1, but A is scaled up.
  • j=3: The same of 1, but A is scaled down.
  • j=4: A = U*D*V where U and V are random orthogonal matrices and D has 3*min(M,N)/4 random entries (> 0.1) taken from a uniform distribution (0,1) and the remaining entries set to 0. A is rank-deficient.
  • j=5: The same of 4, but A is scaled up.
  • j=6: The same of 5, but A is scaled down.
• 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.
• NN — NN is INTEGER. The number of values of N contained in the vector NVAL.
• NVAL — NVAL is INTEGER array, dimension (NN). The values of the matrix column dimension N.
• NNS — NNS is INTEGER. The number of values of NRHS contained in the vector NSVAL.
• NSVAL — NSVAL is INTEGER array, dimension (NNS). The values of the number of right hand sides NRHS.
• NNB — NNB is INTEGER. The number of values of NB and NX contained in the vectors NBVAL and NXVAL. The blocking parameters are used in pairs (NB,NX).
• NBVAL — NBVAL is INTEGER array, dimension (NNB). The values of the blocksize NB.
• NXVAL — NXVAL is INTEGER array, dimension (NNB). The values of the crossover point NX.
• 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.
• TSTERR — TSTERR is LOGICAL. Flag that indicates whether error exits are to be tested.
• A — A is DOUBLE PRECISION array, dimension (MMAX*NMAX) where MMAX is the maximum value of M in MVAL and NMAX is the maximum value of N in NVAL.
• COPYA — COPYA is DOUBLE PRECISION array, dimension (MMAX*NMAX).
• B — B is DOUBLE PRECISION array, dimension (MMAX*NSMAX) where MMAX is the maximum value of M in MVAL and NSMAX is the maximum value of NRHS in NSVAL.
• COPYB — COPYB is DOUBLE PRECISION array, dimension (MMAX*NSMAX).
• C — C is DOUBLE PRECISION array, dimension (MMAX*NSMAX).
• S — S is DOUBLE PRECISION array, dimension (min(MMAX,NMAX)).
• COPYS — COPYS is DOUBLE PRECISION array, dimension (min(MMAX,NMAX)).
• NOUT — NOUT is INTEGER. The unit number for output.

👑 Author

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

Definition at line 189 of file ddrvls.f.

🌸 Author

Generated automatically by Doxygen for LAPACK from the source code.

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and that’s the tea, bestie: source/version/date vibes are LAPACK, Version 3.12.0, and TESTING/LIN/ddrvls.f(3) — mwah 💖🦋✨