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      std::abs(std::valarray)

      From cppreference.com
      <cpp‎ |numeric‎ |valarray
       
       
       
      std::valarray
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      Defined in header<valarray>
      template<class T>
      valarray<T> abs(const valarray<T>& va);

      Computes absolute value of each element in the value array.

      Contents

      [edit]Parameters

      va - value array to apply the operation to

      [edit]Return value

      Value array containing absolute values of the values inva.

      [edit]Notes

      Unqualified function (abs) is used to perform the computation. If such function is not available,std::abs is used due toargument-dependent lookup.

      The function can be implemented with the return type different fromstd::valarray. In this case, the replacement type has the following properties:

      [edit]Possible implementation

      template<class T>valarray<T> abs(const valarray<T>& va){    valarray<T> other= va;for(T& i: other)        i= abs(i); return other;// proxy object may be returned}

      [edit]Example

      Run this code
      #include <iostream>#include <valarray> int main(){std::valarray<int> v{1,-2,3,-4,5,-6,7,-8};std::valarray<int> v2= std::abs(v);for(auto n: v2)std::cout<< n<<' ';std::cout<<'\n';}

      Output:

      1 2 3 4 5 6 7 8

      [edit]See also

      computes absolute value of an integral value (\(\small{|x|}\)|x|)
      (function)[edit]
      absolute value of a floating point value (\(\small{|x|}\)|x|)
      (function)[edit]
      returns the magnitude of a complex number
      (function template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/valarray/abs&oldid=160792"

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