70 lines
2.2 KiB
C++
70 lines
2.2 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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static integer c__1 = 1;
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doublereal dlanst_(char *norm, integer *n, doublereal *d__, doublereal *e, ftnlen norm_len)
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{
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integer i__1;
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doublereal ret_val, d__1, d__2, d__3;
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double sqrt(doublereal);
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integer i__;
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doublereal sum, scale;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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doublereal anorm;
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extern logical disnan_(doublereal *);
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extern int dlassq_(integer *, doublereal *, integer *, doublereal *, doublereal *);
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--e;
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--d__;
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if (*n <= 0) {
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anorm = 0.;
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} else if (lsame_(norm, (char *)"M", (ftnlen)1, (ftnlen)1)) {
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anorm = (d__1 = d__[*n], abs(d__1));
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i__1 = *n - 1;
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for (i__ = 1; i__ <= i__1; ++i__) {
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sum = (d__1 = d__[i__], abs(d__1));
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if (anorm < sum || disnan_(&sum)) {
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anorm = sum;
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}
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sum = (d__1 = e[i__], abs(d__1));
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if (anorm < sum || disnan_(&sum)) {
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anorm = sum;
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}
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}
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} else if (lsame_(norm, (char *)"O", (ftnlen)1, (ftnlen)1) || *(unsigned char *)norm == '1' ||
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lsame_(norm, (char *)"I", (ftnlen)1, (ftnlen)1)) {
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if (*n == 1) {
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anorm = abs(d__[1]);
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} else {
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anorm = abs(d__[1]) + abs(e[1]);
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sum = (d__1 = e[*n - 1], abs(d__1)) + (d__2 = d__[*n], abs(d__2));
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if (anorm < sum || disnan_(&sum)) {
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anorm = sum;
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}
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i__1 = *n - 1;
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for (i__ = 2; i__ <= i__1; ++i__) {
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sum = (d__1 = d__[i__], abs(d__1)) + (d__2 = e[i__], abs(d__2)) +
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(d__3 = e[i__ - 1], abs(d__3));
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if (anorm < sum || disnan_(&sum)) {
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anorm = sum;
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}
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}
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}
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} else if (lsame_(norm, (char *)"F", (ftnlen)1, (ftnlen)1) || lsame_(norm, (char *)"E", (ftnlen)1, (ftnlen)1)) {
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scale = 0.;
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sum = 1.;
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if (*n > 1) {
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i__1 = *n - 1;
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dlassq_(&i__1, &e[1], &c__1, &scale, &sum);
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sum *= 2;
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}
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dlassq_(n, &d__[1], &c__1, &scale, &sum);
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anorm = scale * sqrt(sum);
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}
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ret_val = anorm;
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return ret_val;
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}
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#ifdef __cplusplus
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}
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#endif
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