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  /// Useful enum that represents coordiante axes.
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  /// Useful enum that represents coordiante axes.
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  enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
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  enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
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  inline bool isnan(double x) { return x != x; }
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  inline bool isnan(double x) { return x != x; }
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  template<class Scalar>
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  Scalar s_min(Scalar a, Scalar b)
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  {
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    return a<b ? a : b;
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  }
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  template<class Scalar>
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  Scalar s_max(Scalar a, Scalar b)
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  {
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    return a>b ? a : b;
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  }
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  /// Template for a function that squares the argument.
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  /// Template for a function that squares the argument.
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  template <class Scalar>
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  template <class Scalar>
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  inline Scalar sqr(Scalar x) {///
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  inline Scalar sqr(Scalar x) {///
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    return x*x;}
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    return x*x;}
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