Add graph references

2026-06-28 13:49:01 +01:00
parent 0a9807e448
commit a11edf0c53
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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 DLASSQ updates a sum of squares represented in scaled form.   
+
+    =========== DOCUMENTATION ===========   
+
+   Online html documentation available at   
+              http://www.netlib.org/lapack/explore-html/   
+
+   > \htmlonly   
+   > Download DLASSQ + dependencies   
+   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlassq.
+f">   
+   > [TGZ]</a>   
+   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlassq.
+f">   
+   > [ZIP]</a>   
+   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlassq.
+f">   
+   > [TXT]</a>   
+   > \endhtmlonly   
+
+    Definition:   
+    ===========   
+
+         SUBROUTINE DLASSQ( N, X, INCX, SCALE, SUMSQ )   
+
+         INTEGER            INCX, N   
+         DOUBLE PRECISION   SCALE, SUMSQ   
+         DOUBLE PRECISION   X( * )   
+
+
+   > \par Purpose:   
+    =============   
+   >   
+   > \verbatim   
+   >   
+   > DLASSQ  returns the values  scl  and  smsq  such that   
+   >   
+   >    ( scl**2 )*smsq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,   
+   >   
+   > where  x( i ) = X( 1 + ( i - 1 )*INCX ). The value of  sumsq  is   
+   > assumed to be non-negative and  scl  returns the value   
+   >   
+   >    scl = max( scale, abs( x( i ) ) ).   
+   >   
+   > scale and sumsq must be supplied in SCALE and SUMSQ and   
+   > scl and smsq are overwritten on SCALE and SUMSQ respectively.   
+   >   
+   > The routine makes only one pass through the vector x.   
+   > \endverbatim   
+
+    Arguments:   
+    ==========   
+
+   > \param[in] N   
+   > \verbatim   
+   >          N is INTEGER   
+   >          The number of elements to be used from the vector X.   
+   > \endverbatim   
+   >   
+   > \param[in] X   
+   > \verbatim   
+   >          X is DOUBLE PRECISION array, dimension (N)   
+   >          The vector for which a scaled sum of squares is computed.   
+   >             x( i )  = X( 1 + ( i - 1 )*INCX ), 1 <= i <= n.   
+   > \endverbatim   
+   >   
+   > \param[in] INCX   
+   > \verbatim   
+   >          INCX is INTEGER   
+   >          The increment between successive values of the vector X.   
+   >          INCX > 0.   
+   > \endverbatim   
+   >   
+   > \param[in,out] SCALE   
+   > \verbatim   
+   >          SCALE is DOUBLE PRECISION   
+   >          On entry, the value  scale  in the equation above.   
+   >          On exit, SCALE is overwritten with  scl , the scaling factor   
+   >          for the sum of squares.   
+   > \endverbatim   
+   >   
+   > \param[in,out] SUMSQ   
+   > \verbatim   
+   >          SUMSQ is DOUBLE PRECISION   
+   >          On entry, the value  sumsq  in the equation above.   
+   >          On exit, SUMSQ is overwritten with  smsq , the basic sum of   
+   >          squares from which  scl  has been factored out.   
+   > \endverbatim   
+
+    Authors:   
+    ========   
+
+   > \author Univ. of Tennessee   
+   > \author Univ. of California Berkeley   
+   > \author Univ. of Colorado Denver   
+   > \author NAG Ltd.   
+
+   > \date September 2012   
+
+   > \ingroup auxOTHERauxiliary   
+
+    =====================================================================   
+   Subroutine */ int igraphdlassq_(integer *n, doublereal *x, integer *incx, 
+	doublereal *scale, doublereal *sumsq)
+{
+    /* System generated locals */
+    integer i__1, i__2;
+    doublereal d__1;
+
+    /* Local variables */
+    integer ix;
+    doublereal absxi;
+    extern logical igraphdisnan_(doublereal *);
+
+
+/*  -- LAPACK auxiliary routine (version 3.4.2) --   
+    -- LAPACK is a software package provided by Univ. of Tennessee,    --   
+    -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--   
+       September 2012   
+
+
+   =====================================================================   
+
+
+       Parameter adjustments */
+    --x;
+
+    /* Function Body */
+    if (*n > 0) {
+	i__1 = (*n - 1) * *incx + 1;
+	i__2 = *incx;
+	for (ix = 1; i__2 < 0 ? ix >= i__1 : ix <= i__1; ix += i__2) {
+	    absxi = (d__1 = x[ix], abs(d__1));
+	    if (absxi > 0. || igraphdisnan_(&absxi)) {
+		if (*scale < absxi) {
+/* Computing 2nd power */
+		    d__1 = *scale / absxi;
+		    *sumsq = *sumsq * (d__1 * d__1) + 1;
+		    *scale = absxi;
+		} else {
+/* Computing 2nd power */
+		    d__1 = absxi / *scale;
+		    *sumsq += d__1 * d__1;
+		}
+	    }
+/* L10: */
+	}
+    }
+    return 0;
+
+/*     End of DLASSQ */
+
+} /* igraphdlassq_ */
+