31 lines
760 B
C++
31 lines
760 B
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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doublereal dlapy3_(doublereal *x, doublereal *y, doublereal *z__)
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{
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doublereal ret_val, d__1, d__2, d__3;
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double sqrt(doublereal);
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doublereal w, xabs, yabs, zabs;
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extern doublereal dlamch_(char *, ftnlen);
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doublereal hugeval;
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hugeval = dlamch_((char *)"Overflow", (ftnlen)8);
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xabs = abs(*x);
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yabs = abs(*y);
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zabs = abs(*z__);
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d__1 = max(xabs, yabs);
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w = max(d__1, zabs);
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if (w == 0. || w > hugeval) {
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ret_val = xabs + yabs + zabs;
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} else {
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d__1 = xabs / w;
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d__2 = yabs / w;
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d__3 = zabs / w;
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ret_val = w * sqrt(d__1 * d__1 + d__2 * d__2 + d__3 * d__3);
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}
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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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