freebsd-dev/contrib/libf2c/libF77/c_log.c

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#include "f2c.h"
#undef abs
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#include "math.h"
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extern double f__cabs (double, double);
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void
c_log (complex * r, complex * z)
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{
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double zi, zr;
r->i = atan2 (zi = z->i, zr = z->r);
r->r = log (f__cabs (zr, zi));
}