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authorshmel1k <shmel1k@ydb.tech>2022-09-02 12:44:59 +0300
committershmel1k <shmel1k@ydb.tech>2022-09-02 12:44:59 +0300
commit90d450f74722da7859d6f510a869f6c6908fd12f (patch)
tree538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/clapack/zlangb.c
parent01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff)
downloadydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz
[] add metering mode to CLI
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+/* zlangb.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 integer c__1 = 1;
+
+doublereal zlangb_(char *norm, integer *n, integer *kl, integer *ku,
+ doublecomplex *ab, integer *ldab, doublereal *work)
+{
+ /* System generated locals */
+ integer ab_dim1, ab_offset, i__1, i__2, i__3, i__4, i__5, i__6;
+ doublereal ret_val, d__1, d__2;
+
+ /* Builtin functions */
+ double z_abs(doublecomplex *), sqrt(doublereal);
+
+ /* Local variables */
+ integer i__, j, k, l;
+ doublereal sum, scale;
+ extern logical lsame_(char *, char *);
+ doublereal value;
+ extern /* Subroutine */ int zlassq_(integer *, doublecomplex *, integer *,
+ doublereal *, doublereal *);
+
+
+/* -- LAPACK auxiliary routine (version 3.2) -- */
+/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/* November 2006 */
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* ZLANGB returns the value of the one norm, or the Frobenius norm, or */
+/* the infinity norm, or the element of largest absolute value of an */
+/* n by n band matrix A, with kl sub-diagonals and ku super-diagonals. */
+
+/* Description */
+/* =========== */
+
+/* ZLANGB returns the value */
+
+/* ZLANGB = ( max(abs(A(i,j))), NORM = 'M' or 'm' */
+/* ( */
+/* ( norm1(A), NORM = '1', 'O' or 'o' */
+/* ( */
+/* ( normI(A), NORM = 'I' or 'i' */
+/* ( */
+/* ( normF(A), NORM = 'F', 'f', 'E' or 'e' */
+
+/* where norm1 denotes the one norm of a matrix (maximum column sum), */
+/* normI denotes the infinity norm of a matrix (maximum row sum) and */
+/* normF denotes the Frobenius norm of a matrix (square root of sum of */
+/* squares). Note that max(abs(A(i,j))) is not a consistent matrix norm. */
+
+/* Arguments */
+/* ========= */
+
+/* NORM (input) CHARACTER*1 */
+/* Specifies the value to be returned in ZLANGB as described */
+/* above. */
+
+/* N (input) INTEGER */
+/* The order of the matrix A. N >= 0. When N = 0, ZLANGB is */
+/* set to zero. */
+
+/* KL (input) INTEGER */
+/* The number of sub-diagonals of the matrix A. KL >= 0. */
+
+/* KU (input) INTEGER */
+/* The number of super-diagonals of the matrix A. KU >= 0. */
+
+/* AB (input) COMPLEX*16 array, dimension (LDAB,N) */
+/* The band matrix A, stored in rows 1 to KL+KU+1. The j-th */
+/* column of A is stored in the j-th column of the array AB as */
+/* follows: */
+/* AB(ku+1+i-j,j) = A(i,j) for max(1,j-ku)<=i<=min(n,j+kl). */
+
+/* LDAB (input) INTEGER */
+/* The leading dimension of the array AB. LDAB >= KL+KU+1. */
+
+/* WORK (workspace) DOUBLE PRECISION array, dimension (MAX(1,LWORK)), */
+/* where LWORK >= N when NORM = 'I'; otherwise, WORK is not */
+/* referenced. */
+
+/* ===================================================================== */
+
+/* .. Parameters .. */
+/* .. */
+/* .. Local Scalars .. */
+/* .. */
+/* .. External Functions .. */
+/* .. */
+/* .. External Subroutines .. */
+/* .. */
+/* .. Intrinsic Functions .. */
+/* .. */
+/* .. Executable Statements .. */
+
+ /* Parameter adjustments */
+ ab_dim1 = *ldab;
+ ab_offset = 1 + ab_dim1;
+ ab -= ab_offset;
+ --work;
+
+ /* Function Body */
+ if (*n == 0) {
+ value = 0.;
+ } else if (lsame_(norm, "M")) {
+
+/* Find max(abs(A(i,j))). */
+
+ value = 0.;
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+/* Computing MAX */
+ i__2 = *ku + 2 - j;
+/* Computing MIN */
+ i__4 = *n + *ku + 1 - j, i__5 = *kl + *ku + 1;
+ i__3 = min(i__4,i__5);
+ for (i__ = max(i__2,1); i__ <= i__3; ++i__) {
+/* Computing MAX */
+ d__1 = value, d__2 = z_abs(&ab[i__ + j * ab_dim1]);
+ value = max(d__1,d__2);
+/* L10: */
+ }
+/* L20: */
+ }
+ } else if (lsame_(norm, "O") || *(unsigned char *)
+ norm == '1') {
+
+/* Find norm1(A). */
+
+ value = 0.;
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ sum = 0.;
+/* Computing MAX */
+ i__3 = *ku + 2 - j;
+/* Computing MIN */
+ i__4 = *n + *ku + 1 - j, i__5 = *kl + *ku + 1;
+ i__2 = min(i__4,i__5);
+ for (i__ = max(i__3,1); i__ <= i__2; ++i__) {
+ sum += z_abs(&ab[i__ + j * ab_dim1]);
+/* L30: */
+ }
+ value = max(value,sum);
+/* L40: */
+ }
+ } else if (lsame_(norm, "I")) {
+
+/* Find normI(A). */
+
+ i__1 = *n;
+ for (i__ = 1; i__ <= i__1; ++i__) {
+ work[i__] = 0.;
+/* L50: */
+ }
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+ k = *ku + 1 - j;
+/* Computing MAX */
+ i__2 = 1, i__3 = j - *ku;
+/* Computing MIN */
+ i__5 = *n, i__6 = j + *kl;
+ i__4 = min(i__5,i__6);
+ for (i__ = max(i__2,i__3); i__ <= i__4; ++i__) {
+ work[i__] += z_abs(&ab[k + i__ + j * ab_dim1]);
+/* L60: */
+ }
+/* L70: */
+ }
+ value = 0.;
+ i__1 = *n;
+ for (i__ = 1; i__ <= i__1; ++i__) {
+/* Computing MAX */
+ d__1 = value, d__2 = work[i__];
+ value = max(d__1,d__2);
+/* L80: */
+ }
+ } else if (lsame_(norm, "F") || lsame_(norm, "E")) {
+
+/* Find normF(A). */
+
+ scale = 0.;
+ sum = 1.;
+ i__1 = *n;
+ for (j = 1; j <= i__1; ++j) {
+/* Computing MAX */
+ i__4 = 1, i__2 = j - *ku;
+ l = max(i__4,i__2);
+ k = *ku + 1 - j + l;
+/* Computing MIN */
+ i__2 = *n, i__3 = j + *kl;
+ i__4 = min(i__2,i__3) - l + 1;
+ zlassq_(&i__4, &ab[k + j * ab_dim1], &c__1, &scale, &sum);
+/* L90: */
+ }
+ value = scale * sqrt(sum);
+ }
+
+ ret_val = value;
+ return ret_val;
+
+/* End of ZLANGB */
+
+} /* zlangb_ */