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agent_compositor_test/references/igraph-1.0.1/vendor/lapack/dsyrk.c
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/* -- translated by f2c (version 20240504).
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"
/* > \brief \b DSYRK
=========== DOCUMENTATION ===========
Online html documentation available at
http://www.netlib.org/lapack/explore-html/
Definition:
===========
SUBROUTINE DSYRK(UPLO,TRANS,N,K,ALPHA,A,LDA,BETA,C,LDC)
DOUBLE PRECISION ALPHA,BETA
INTEGER K,LDA,LDC,N
CHARACTER TRANS,UPLO
DOUBLE PRECISION A(LDA,*),C(LDC,*)
> \par Purpose:
=============
>
> \verbatim
>
> DSYRK performs one of the symmetric rank k operations
>
> C := alpha*A*A**T + beta*C,
>
> or
>
> C := alpha*A**T*A + beta*C,
>
> where alpha and beta are scalars, C is an n by n symmetric matrix
> and A is an n by k matrix in the first case and a k by n matrix
> in the second case.
> \endverbatim
Arguments:
==========
> \param[in] UPLO
> \verbatim
> UPLO is CHARACTER*1
> On entry, UPLO specifies whether the upper or lower
> triangular part of the array C is to be referenced as
> follows:
>
> UPLO = 'U' or 'u' Only the upper triangular part of C
> is to be referenced.
>
> UPLO = 'L' or 'l' Only the lower triangular part of C
> is to be referenced.
> \endverbatim
>
> \param[in] TRANS
> \verbatim
> TRANS is CHARACTER*1
> On entry, TRANS specifies the operation to be performed as
> follows:
>
> TRANS = 'N' or 'n' C := alpha*A*A**T + beta*C.
>
> TRANS = 'T' or 't' C := alpha*A**T*A + beta*C.
>
> TRANS = 'C' or 'c' C := alpha*A**T*A + beta*C.
> \endverbatim
>
> \param[in] N
> \verbatim
> N is INTEGER
> On entry, N specifies the order of the matrix C. N must be
> at least zero.
> \endverbatim
>
> \param[in] K
> \verbatim
> K is INTEGER
> On entry with TRANS = 'N' or 'n', K specifies the number
> of columns of the matrix A, and on entry with
> TRANS = 'T' or 't' or 'C' or 'c', K specifies the number
> of rows of the matrix A. K must be at least zero.
> \endverbatim
>
> \param[in] ALPHA
> \verbatim
> ALPHA is DOUBLE PRECISION.
> On entry, ALPHA specifies the scalar alpha.
> \endverbatim
>
> \param[in] A
> \verbatim
> A is DOUBLE PRECISION array, dimension ( LDA, ka ), where ka is
> k when TRANS = 'N' or 'n', and is n otherwise.
> Before entry with TRANS = 'N' or 'n', the leading n by k
> part of the array A must contain the matrix A, otherwise
> the leading k by n part of the array A must contain the
> matrix A.
> \endverbatim
>
> \param[in] LDA
> \verbatim
> LDA is INTEGER
> On entry, LDA specifies the first dimension of A as declared
> in the calling (sub) program. When TRANS = 'N' or 'n'
> then LDA must be at least max( 1, n ), otherwise LDA must
> be at least max( 1, k ).
> \endverbatim
>
> \param[in] BETA
> \verbatim
> BETA is DOUBLE PRECISION.
> On entry, BETA specifies the scalar beta.
> \endverbatim
>
> \param[in,out] C
> \verbatim
> C is DOUBLE PRECISION array, dimension ( LDC, N )
> Before entry with UPLO = 'U' or 'u', the leading n by n
> upper triangular part of the array C must contain the upper
> triangular part of the symmetric matrix and the strictly
> lower triangular part of C is not referenced. On exit, the
> upper triangular part of the array C is overwritten by the
> upper triangular part of the updated matrix.
> Before entry with UPLO = 'L' or 'l', the leading n by n
> lower triangular part of the array C must contain the lower
> triangular part of the symmetric matrix and the strictly
> upper triangular part of C is not referenced. On exit, the
> lower triangular part of the array C is overwritten by the
> lower triangular part of the updated matrix.
> \endverbatim
>
> \param[in] LDC
> \verbatim
> LDC is INTEGER
> On entry, LDC specifies the first dimension of C as declared
> in the calling (sub) program. LDC must be at least
> max( 1, n ).
> \endverbatim
Authors:
========
> \author Univ. of Tennessee
> \author Univ. of California Berkeley
> \author Univ. of Colorado Denver
> \author NAG Ltd.
> \ingroup herk
> \par Further Details:
=====================
>
> \verbatim
>
> Level 3 Blas routine.
>
> -- Written on 8-February-1989.
> Jack Dongarra, Argonne National Laboratory.
> Iain Duff, AERE Harwell.
> Jeremy Du Croz, Numerical Algorithms Group Ltd.
> Sven Hammarling, Numerical Algorithms Group Ltd.
> \endverbatim
>
=====================================================================
Subroutine */ int igraphdsyrk_(char *uplo, char *trans, integer *n, integer *k,
doublereal *alpha, doublereal *a, integer *lda, doublereal *beta,
doublereal *c__, integer *ldc)
{
/* System generated locals */
integer a_dim1, a_offset, c_dim1, c_offset, i__1, i__2, i__3;
/* Local variables */
integer i__, j, l, info;
doublereal temp;
extern logical igraphlsame_(char *, char *);
integer nrowa;
logical upper;
extern /* Subroutine */ int igraphxerbla_(char *, integer *, ftnlen);
/* -- Reference BLAS level3 routine --
-- Reference BLAS is a software package provided by Univ. of Tennessee, --
-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
=====================================================================
Test the input parameters.
Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
c_dim1 = *ldc;
c_offset = 1 + c_dim1;
c__ -= c_offset;
/* Function Body */
if (igraphlsame_(trans, "N")) {
nrowa = *n;
} else {
nrowa = *k;
}
upper = igraphlsame_(uplo, "U");
info = 0;
if (! upper && ! igraphlsame_(uplo, "L")) {
info = 1;
} else if (! igraphlsame_(trans, "N") && ! igraphlsame_(trans,
"T") && ! igraphlsame_(trans, "C")) {
info = 2;
} else if (*n < 0) {
info = 3;
} else if (*k < 0) {
info = 4;
} else if (*lda < max(1,nrowa)) {
info = 7;
} else if (*ldc < max(1,*n)) {
info = 10;
}
if (info != 0) {
igraphxerbla_("DSYRK ", &info, (ftnlen)6);
return 0;
}
/* Quick return if possible. */
if (*n == 0 || (*alpha == 0. || *k == 0) && *beta == 1.) {
return 0;
}
/* And when alpha.eq.zero. */
if (*alpha == 0.) {
if (upper) {
if (*beta == 0.) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = j;
for (i__ = 1; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = 0.;
/* L10: */
}
/* L20: */
}
} else {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = j;
for (i__ = 1; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
/* L30: */
}
/* L40: */
}
}
} else {
if (*beta == 0.) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = *n;
for (i__ = j; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = 0.;
/* L50: */
}
/* L60: */
}
} else {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = *n;
for (i__ = j; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
/* L70: */
}
/* L80: */
}
}
}
return 0;
}
/* Start the operations. */
if (igraphlsame_(trans, "N")) {
/* Form C := alpha*A*A**T + beta*C. */
if (upper) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
if (*beta == 0.) {
i__2 = j;
for (i__ = 1; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = 0.;
/* L90: */
}
} else if (*beta != 1.) {
i__2 = j;
for (i__ = 1; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
/* L100: */
}
}
i__2 = *k;
for (l = 1; l <= i__2; ++l) {
if (a[j + l * a_dim1] != 0.) {
temp = *alpha * a[j + l * a_dim1];
i__3 = j;
for (i__ = 1; i__ <= i__3; ++i__) {
c__[i__ + j * c_dim1] += temp * a[i__ + l *
a_dim1];
/* L110: */
}
}
/* L120: */
}
/* L130: */
}
} else {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
if (*beta == 0.) {
i__2 = *n;
for (i__ = j; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = 0.;
/* L140: */
}
} else if (*beta != 1.) {
i__2 = *n;
for (i__ = j; i__ <= i__2; ++i__) {
c__[i__ + j * c_dim1] = *beta * c__[i__ + j * c_dim1];
/* L150: */
}
}
i__2 = *k;
for (l = 1; l <= i__2; ++l) {
if (a[j + l * a_dim1] != 0.) {
temp = *alpha * a[j + l * a_dim1];
i__3 = *n;
for (i__ = j; i__ <= i__3; ++i__) {
c__[i__ + j * c_dim1] += temp * a[i__ + l *
a_dim1];
/* L160: */
}
}
/* L170: */
}
/* L180: */
}
}
} else {
/* Form C := alpha*A**T*A + beta*C. */
if (upper) {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = j;
for (i__ = 1; i__ <= i__2; ++i__) {
temp = 0.;
i__3 = *k;
for (l = 1; l <= i__3; ++l) {
temp += a[l + i__ * a_dim1] * a[l + j * a_dim1];
/* L190: */
}
if (*beta == 0.) {
c__[i__ + j * c_dim1] = *alpha * temp;
} else {
c__[i__ + j * c_dim1] = *alpha * temp + *beta * c__[
i__ + j * c_dim1];
}
/* L200: */
}
/* L210: */
}
} else {
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = *n;
for (i__ = j; i__ <= i__2; ++i__) {
temp = 0.;
i__3 = *k;
for (l = 1; l <= i__3; ++l) {
temp += a[l + i__ * a_dim1] * a[l + j * a_dim1];
/* L220: */
}
if (*beta == 0.) {
c__[i__ + j * c_dim1] = *alpha * temp;
} else {
c__[i__ + j * c_dim1] = *alpha * temp + *beta * c__[
i__ + j * c_dim1];
}
/* L230: */
}
/* L240: */
}
}
}
return 0;
/* End of DSYRK */
} /* igraphdsyrk_ */
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