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Add sign() utility function.

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Atgeirr Flø Rasmussen 2013-06-03 00:32:44 +02:00
parent 0376cb0fff
commit 90f3886d20
1 changed files with 12 additions and 0 deletions
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12
opm/autodiff/AutoDiffHelpers.hpp
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@ -550,4 +550,16 @@ private:
};
/// Return a vector of (-1.0, 0.0 or 1.0), depending on sign per element.
inline Eigen::ArrayXd sign (const Eigen::ArrayXd& x)
{
const int n = x.size();
Eigen::ArrayXd retval(n);
for (int i = 0; i < n; ++i) {
retval[i] = x[i] < 0.0 ? -1.0 : (x[i] > 0.0 ? 1.0 : 0.0);
}
return retval;
}
#endif // OPM_AUTODIFFHELPERS_HEADER_INCLUDED