47 lines
1.0 KiB
C++
47 lines
1.0 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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int drscl_(integer *n, doublereal *sa, doublereal *sx, integer *incx)
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{
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doublereal mul, cden;
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logical done;
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doublereal cnum, cden1, cnum1;
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extern int dscal_(integer *, doublereal *, doublereal *, integer *),
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dlabad_(doublereal *, doublereal *);
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extern doublereal dlamch_(char *, ftnlen);
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doublereal bignum, smlnum;
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--sx;
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if (*n <= 0) {
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return 0;
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}
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smlnum = dlamch_((char *)"S", (ftnlen)1);
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bignum = 1. / smlnum;
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dlabad_(&smlnum, &bignum);
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cden = *sa;
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cnum = 1.;
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L10:
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cden1 = cden * smlnum;
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cnum1 = cnum / bignum;
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if (abs(cden1) > abs(cnum) && cnum != 0.) {
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mul = smlnum;
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done = FALSE_;
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cden = cden1;
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} else if (abs(cnum1) > abs(cden)) {
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mul = bignum;
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done = FALSE_;
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cnum = cnum1;
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} else {
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mul = cnum / cden;
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done = TRUE_;
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}
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dscal_(n, &mul, &sx[1], incx);
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if (!done) {
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goto L10;
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}
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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