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author | shmel1k <shmel1k@ydb.tech> | 2022-09-02 12:44:59 +0300 |
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committer | shmel1k <shmel1k@ydb.tech> | 2022-09-02 12:44:59 +0300 |
commit | 90d450f74722da7859d6f510a869f6c6908fd12f (patch) | |
tree | 538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/clapack/dlarf.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/dlarf.c')
-rw-r--r-- | contrib/libs/clapack/dlarf.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/contrib/libs/clapack/dlarf.c b/contrib/libs/clapack/dlarf.c new file mode 100644 index 00000000000..aba8a5929be --- /dev/null +++ b/contrib/libs/clapack/dlarf.c @@ -0,0 +1,193 @@ +/* dlarf.f -- translated by f2c (version 20061008). + You must link the resulting object file with libf2c: + on Microsoft Windows system, link with libf2c.lib; + on Linux or Unix systems, link with .../path/to/libf2c.a -lm + or, if you install libf2c.a in a standard place, with -lf2c -lm + -- in that order, at the end of the command line, as in + cc *.o -lf2c -lm + Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., + + http://www.netlib.org/f2c/libf2c.zip +*/ + +#include "f2c.h" +#include "blaswrap.h" + +/* Table of constant values */ + +static doublereal c_b4 = 1.; +static doublereal c_b5 = 0.; +static integer c__1 = 1; + +/* Subroutine */ int dlarf_(char *side, integer *m, integer *n, doublereal *v, + integer *incv, doublereal *tau, doublereal *c__, integer *ldc, + doublereal *work) +{ + /* System generated locals */ + integer c_dim1, c_offset; + doublereal d__1; + + /* Local variables */ + integer i__; + logical applyleft; + extern /* Subroutine */ int dger_(integer *, integer *, doublereal *, + doublereal *, integer *, doublereal *, integer *, doublereal *, + integer *); + extern logical lsame_(char *, char *); + extern /* Subroutine */ int dgemv_(char *, integer *, integer *, + doublereal *, doublereal *, integer *, doublereal *, integer *, + doublereal *, doublereal *, integer *); + integer lastc, lastv; + extern integer iladlc_(integer *, integer *, doublereal *, integer *), + iladlr_(integer *, integer *, doublereal *, integer *); + + +/* -- LAPACK auxiliary routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* DLARF applies a real elementary reflector H to a real m by n matrix */ +/* C, from either the left or the right. H is represented in the form */ + +/* H = I - tau * v * v' */ + +/* where tau is a real scalar and v is a real vector. */ + +/* If tau = 0, then H is taken to be the unit matrix. */ + +/* Arguments */ +/* ========= */ + +/* SIDE (input) CHARACTER*1 */ +/* = 'L': form H * C */ +/* = 'R': form C * H */ + +/* M (input) INTEGER */ +/* The number of rows of the matrix C. */ + +/* N (input) INTEGER */ +/* The number of columns of the matrix C. */ + +/* V (input) DOUBLE PRECISION array, dimension */ +/* (1 + (M-1)*abs(INCV)) if SIDE = 'L' */ +/* or (1 + (N-1)*abs(INCV)) if SIDE = 'R' */ +/* The vector v in the representation of H. V is not used if */ +/* TAU = 0. */ + +/* INCV (input) INTEGER */ +/* The increment between elements of v. INCV <> 0. */ + +/* TAU (input) DOUBLE PRECISION */ +/* The value tau in the representation of H. */ + +/* C (input/output) DOUBLE PRECISION array, dimension (LDC,N) */ +/* On entry, the m by n matrix C. */ +/* On exit, C is overwritten by the matrix H * C if SIDE = 'L', */ +/* or C * H if SIDE = 'R'. */ + +/* LDC (input) INTEGER */ +/* The leading dimension of the array C. LDC >= max(1,M). */ + +/* WORK (workspace) DOUBLE PRECISION array, dimension */ +/* (N) if SIDE = 'L' */ +/* or (M) if SIDE = 'R' */ + +/* ===================================================================== */ + +/* .. Parameters .. */ +/* .. */ +/* .. Local Scalars .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. External Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + + /* Parameter adjustments */ + --v; + c_dim1 = *ldc; + c_offset = 1 + c_dim1; + c__ -= c_offset; + --work; + + /* Function Body */ + applyleft = lsame_(side, "L"); + lastv = 0; + lastc = 0; + if (*tau != 0.) { +/* Set up variables for scanning V. LASTV begins pointing to the end */ +/* of V. */ + if (applyleft) { + lastv = *m; + } else { + lastv = *n; + } + if (*incv > 0) { + i__ = (lastv - 1) * *incv + 1; + } else { + i__ = 1; + } +/* Look for the last non-zero row in V. */ + while(lastv > 0 && v[i__] == 0.) { + --lastv; + i__ -= *incv; + } + if (applyleft) { +/* Scan for the last non-zero column in C(1:lastv,:). */ + lastc = iladlc_(&lastv, n, &c__[c_offset], ldc); + } else { +/* Scan for the last non-zero row in C(:,1:lastv). */ + lastc = iladlr_(m, &lastv, &c__[c_offset], ldc); + } + } +/* Note that lastc.eq.0 renders the BLAS operations null; no special */ +/* case is needed at this level. */ + if (applyleft) { + +/* Form H * C */ + + if (lastv > 0) { + +/* w(1:lastc,1) := C(1:lastv,1:lastc)' * v(1:lastv,1) */ + + dgemv_("Transpose", &lastv, &lastc, &c_b4, &c__[c_offset], ldc, & + v[1], incv, &c_b5, &work[1], &c__1); + +/* C(1:lastv,1:lastc) := C(...) - v(1:lastv,1) * w(1:lastc,1)' */ + + d__1 = -(*tau); + dger_(&lastv, &lastc, &d__1, &v[1], incv, &work[1], &c__1, &c__[ + c_offset], ldc); + } + } else { + +/* Form C * H */ + + if (lastv > 0) { + +/* w(1:lastc,1) := C(1:lastc,1:lastv) * v(1:lastv,1) */ + + dgemv_("No transpose", &lastc, &lastv, &c_b4, &c__[c_offset], ldc, + &v[1], incv, &c_b5, &work[1], &c__1); + +/* C(1:lastc,1:lastv) := C(...) - w(1:lastc,1) * v(1:lastv,1)' */ + + d__1 = -(*tau); + dger_(&lastc, &lastv, &d__1, &work[1], &c__1, &v[1], incv, &c__[ + c_offset], ldc); + } + } + return 0; + +/* End of DLARF */ + +} /* dlarf_ */ |