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|
/* lapack/double/dlasrt.f -- translated by f2c (version 20090411).
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
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/*< SUBROUTINE DLASRT( ID, N, D, INFO ) >*/
/* Subroutine */ int dlasrt_(char *id, integer *n, doublereal *d__, integer *
info, ftnlen id_len)
{
/* System generated locals */
integer i__1, i__2;
/* Local variables */
integer i__, j;
doublereal d1, d2, d3;
integer dir;
doublereal tmp;
integer endd;
extern logical lsame_(const char *, const char *, ftnlen, ftnlen);
integer stack[64] /* was [2][32] */;
doublereal dmnmx;
integer start;
extern /* Subroutine */ int xerbla_(char *, integer *, ftnlen);
integer stkpnt;
/* -- LAPACK routine (version 3.2) -- */
/* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
/* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
/* November 2006 */
/* .. Scalar Arguments .. */
/*< CHARACTER ID >*/
/*< INTEGER INFO, N >*/
/* .. */
/* .. Array Arguments .. */
/*< DOUBLE PRECISION D( * ) >*/
/* .. */
/* Purpose */
/* ======= */
/* Sort the numbers in D in increasing order (if ID = 'I') or */
/* in decreasing order (if ID = 'D' ). */
/* Use Quick Sort, reverting to Insertion sort on arrays of */
/* size <= 20. Dimension of STACK limits N to about 2**32. */
/* Arguments */
/* ========= */
/* ID (input) CHARACTER*1 */
/* = 'I': sort D in increasing order; */
/* = 'D': sort D in decreasing order. */
/* N (input) INTEGER */
/* The length of the array D. */
/* D (input/output) DOUBLE PRECISION array, dimension (N) */
/* On entry, the array to be sorted. */
/* On exit, D has been sorted into increasing order */
/* (D(1) <= ... <= D(N) ) or into decreasing order */
/* (D(1) >= ... >= D(N) ), depending on ID. */
/* INFO (output) INTEGER */
/* = 0: successful exit */
/* < 0: if INFO = -i, the i-th argument had an illegal value */
/* ===================================================================== */
/* .. Parameters .. */
/*< INTEGER SELECT >*/
/*< PARAMETER ( SELECT = 20 ) >*/
/* .. */
/* .. Local Scalars .. */
/*< INTEGER DIR, ENDD, I, J, START, STKPNT >*/
/*< DOUBLE PRECISION D1, D2, D3, DMNMX, TMP >*/
/* .. */
/* .. Local Arrays .. */
/*< INTEGER STACK( 2, 32 ) >*/
/* .. */
/* .. External Functions .. */
/*< LOGICAL LSAME >*/
/*< EXTERNAL LSAME >*/
/* .. */
/* .. External Subroutines .. */
/*< EXTERNAL XERBLA >*/
/* .. */
/* .. Executable Statements .. */
/* Test the input parameters. */
/*< INFO = 0 >*/
/* Parameter adjustments */
--d__;
/* Function Body */
*info = 0;
/*< DIR = -1 >*/
dir = -1;
/*< IF( LSAME( ID, 'D' ) ) THEN >*/
if (lsame_(id, "D", (ftnlen)1, (ftnlen)1)) {
/*< DIR = 0 >*/
dir = 0;
/*< ELSE IF( LSAME( ID, 'I' ) ) THEN >*/
} else if (lsame_(id, "I", (ftnlen)1, (ftnlen)1)) {
/*< DIR = 1 >*/
dir = 1;
/*< END IF >*/
}
/*< IF( DIR.EQ.-1 ) THEN >*/
if (dir == -1) {
/*< INFO = -1 >*/
*info = -1;
/*< ELSE IF( N.LT.0 ) THEN >*/
} else if (*n < 0) {
/*< INFO = -2 >*/
*info = -2;
/*< END IF >*/
}
/*< IF( INFO.NE.0 ) THEN >*/
if (*info != 0) {
/*< CALL XERBLA( 'DLASRT', -INFO ) >*/
i__1 = -(*info);
xerbla_("DLASRT", &i__1, (ftnlen)6);
/*< RETURN >*/
return 0;
/*< END IF >*/
}
/* Quick return if possible */
/*< >*/
if (*n <= 1) {
return 0;
}
/*< STKPNT = 1 >*/
stkpnt = 1;
/*< STACK( 1, 1 ) = 1 >*/
stack[0] = 1;
/*< STACK( 2, 1 ) = N >*/
stack[1] = *n;
/*< 10 CONTINUE >*/
L10:
/*< START = STACK( 1, STKPNT ) >*/
start = stack[(stkpnt << 1) - 2];
/*< ENDD = STACK( 2, STKPNT ) >*/
endd = stack[(stkpnt << 1) - 1];
/*< STKPNT = STKPNT - 1 >*/
--stkpnt;
/*< IF( ENDD-START.LE.SELECT .AND. ENDD-START.GT.0 ) THEN >*/
if (endd - start <= 20 && endd - start > 0) {
/* Do Insertion sort on D( START:ENDD ) */
/*< IF( DIR.EQ.0 ) THEN >*/
if (dir == 0) {
/* Sort into decreasing order */
/*< DO 30 I = START + 1, ENDD >*/
i__1 = endd;
for (i__ = start + 1; i__ <= i__1; ++i__) {
/*< DO 20 J = I, START + 1, -1 >*/
i__2 = start + 1;
for (j = i__; j >= i__2; --j) {
/*< IF( D( J ).GT.D( J-1 ) ) THEN >*/
if (d__[j] > d__[j - 1]) {
/*< DMNMX = D( J ) >*/
dmnmx = d__[j];
/*< D( J ) = D( J-1 ) >*/
d__[j] = d__[j - 1];
/*< D( J-1 ) = DMNMX >*/
d__[j - 1] = dmnmx;
/*< ELSE >*/
} else {
/*< GO TO 30 >*/
goto L30;
/*< END IF >*/
}
/*< 20 CONTINUE >*/
/* L20: */
}
/*< 30 CONTINUE >*/
L30:
;
}
/*< ELSE >*/
} else {
/* Sort into increasing order */
/*< DO 50 I = START + 1, ENDD >*/
i__1 = endd;
for (i__ = start + 1; i__ <= i__1; ++i__) {
/*< DO 40 J = I, START + 1, -1 >*/
i__2 = start + 1;
for (j = i__; j >= i__2; --j) {
/*< IF( D( J ).LT.D( J-1 ) ) THEN >*/
if (d__[j] < d__[j - 1]) {
/*< DMNMX = D( J ) >*/
dmnmx = d__[j];
/*< D( J ) = D( J-1 ) >*/
d__[j] = d__[j - 1];
/*< D( J-1 ) = DMNMX >*/
d__[j - 1] = dmnmx;
/*< ELSE >*/
} else {
/*< GO TO 50 >*/
goto L50;
/*< END IF >*/
}
/*< 40 CONTINUE >*/
/* L40: */
}
/*< 50 CONTINUE >*/
L50:
;
}
/*< END IF >*/
}
/*< ELSE IF( ENDD-START.GT.SELECT ) THEN >*/
} else if (endd - start > 20) {
/* Partition D( START:ENDD ) and stack parts, largest one first */
/* Choose partition entry as median of 3 */
/*< D1 = D( START ) >*/
d1 = d__[start];
/*< D2 = D( ENDD ) >*/
d2 = d__[endd];
/*< I = ( START+ENDD ) / 2 >*/
i__ = (start + endd) / 2;
/*< D3 = D( I ) >*/
d3 = d__[i__];
/*< IF( D1.LT.D2 ) THEN >*/
if (d1 < d2) {
/*< IF( D3.LT.D1 ) THEN >*/
if (d3 < d1) {
/*< DMNMX = D1 >*/
dmnmx = d1;
/*< ELSE IF( D3.LT.D2 ) THEN >*/
} else if (d3 < d2) {
/*< DMNMX = D3 >*/
dmnmx = d3;
/*< ELSE >*/
} else {
/*< DMNMX = D2 >*/
dmnmx = d2;
/*< END IF >*/
}
/*< ELSE >*/
} else {
/*< IF( D3.LT.D2 ) THEN >*/
if (d3 < d2) {
/*< DMNMX = D2 >*/
dmnmx = d2;
/*< ELSE IF( D3.LT.D1 ) THEN >*/
} else if (d3 < d1) {
/*< DMNMX = D3 >*/
dmnmx = d3;
/*< ELSE >*/
} else {
/*< DMNMX = D1 >*/
dmnmx = d1;
/*< END IF >*/
}
/*< END IF >*/
}
/*< IF( DIR.EQ.0 ) THEN >*/
if (dir == 0) {
/* Sort into decreasing order */
/*< I = START - 1 >*/
i__ = start - 1;
/*< J = ENDD + 1 >*/
j = endd + 1;
/*< 60 CONTINUE >*/
L60:
/*< 70 CONTINUE >*/
L70:
/*< J = J - 1 >*/
--j;
/*< >*/
if (d__[j] < dmnmx) {
goto L70;
}
/*< 80 CONTINUE >*/
L80:
/*< I = I + 1 >*/
++i__;
/*< >*/
if (d__[i__] > dmnmx) {
goto L80;
}
/*< IF( I.LT.J ) THEN >*/
if (i__ < j) {
/*< TMP = D( I ) >*/
tmp = d__[i__];
/*< D( I ) = D( J ) >*/
d__[i__] = d__[j];
/*< D( J ) = TMP >*/
d__[j] = tmp;
/*< GO TO 60 >*/
goto L60;
/*< END IF >*/
}
/*< IF( J-START.GT.ENDD-J-1 ) THEN >*/
if (j - start > endd - j - 1) {
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = START >*/
stack[(stkpnt << 1) - 2] = start;
/*< STACK( 2, STKPNT ) = J >*/
stack[(stkpnt << 1) - 1] = j;
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = J + 1 >*/
stack[(stkpnt << 1) - 2] = j + 1;
/*< STACK( 2, STKPNT ) = ENDD >*/
stack[(stkpnt << 1) - 1] = endd;
/*< ELSE >*/
} else {
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = J + 1 >*/
stack[(stkpnt << 1) - 2] = j + 1;
/*< STACK( 2, STKPNT ) = ENDD >*/
stack[(stkpnt << 1) - 1] = endd;
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = START >*/
stack[(stkpnt << 1) - 2] = start;
/*< STACK( 2, STKPNT ) = J >*/
stack[(stkpnt << 1) - 1] = j;
/*< END IF >*/
}
/*< ELSE >*/
} else {
/* Sort into increasing order */
/*< I = START - 1 >*/
i__ = start - 1;
/*< J = ENDD + 1 >*/
j = endd + 1;
/*< 90 CONTINUE >*/
L90:
/*< 100 CONTINUE >*/
L100:
/*< J = J - 1 >*/
--j;
/*< >*/
if (d__[j] > dmnmx) {
goto L100;
}
/*< 110 CONTINUE >*/
L110:
/*< I = I + 1 >*/
++i__;
/*< >*/
if (d__[i__] < dmnmx) {
goto L110;
}
/*< IF( I.LT.J ) THEN >*/
if (i__ < j) {
/*< TMP = D( I ) >*/
tmp = d__[i__];
/*< D( I ) = D( J ) >*/
d__[i__] = d__[j];
/*< D( J ) = TMP >*/
d__[j] = tmp;
/*< GO TO 90 >*/
goto L90;
/*< END IF >*/
}
/*< IF( J-START.GT.ENDD-J-1 ) THEN >*/
if (j - start > endd - j - 1) {
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = START >*/
stack[(stkpnt << 1) - 2] = start;
/*< STACK( 2, STKPNT ) = J >*/
stack[(stkpnt << 1) - 1] = j;
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = J + 1 >*/
stack[(stkpnt << 1) - 2] = j + 1;
/*< STACK( 2, STKPNT ) = ENDD >*/
stack[(stkpnt << 1) - 1] = endd;
/*< ELSE >*/
} else {
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = J + 1 >*/
stack[(stkpnt << 1) - 2] = j + 1;
/*< STACK( 2, STKPNT ) = ENDD >*/
stack[(stkpnt << 1) - 1] = endd;
/*< STKPNT = STKPNT + 1 >*/
++stkpnt;
/*< STACK( 1, STKPNT ) = START >*/
stack[(stkpnt << 1) - 2] = start;
/*< STACK( 2, STKPNT ) = J >*/
stack[(stkpnt << 1) - 1] = j;
/*< END IF >*/
}
/*< END IF >*/
}
/*< END IF >*/
}
/*< >*/
if (stkpnt > 0) {
goto L10;
}
/*< RETURN >*/
return 0;
/* End of DLASRT */
/*< END >*/
} /* dlasrt_ */
#ifdef __cplusplus
}
#endif
|
