template< class T >
valarray<T> log10( const valarray<T>& va );
For each element in va computes common (base 10) logarithm of the value of the element.
[edit] Parameters va - value array to apply the operation to [edit] Return valueValue array containing common logarithms of the values in va.
[edit] NotesUnqualified function (log10) is used to perform the computation. If such function is not available, std::log10 is used due to argument-dependent lookup.
The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:
template<class T> valarray<T> log10(const valarray<T>& va) { valarray<T> other = va; for (T& i : other) i = log10(i); return other; // proxy object may be returned }[edit] Example
#include <cmath> #include <iomanip> #include <iostream> #include <valarray> void show(char const* title, const std::valarray<float>& va) { std::cout << title << " : " << std::right; for (float x : va) std::cout << std::setw(6) << x; std::cout << '\n'; } int main() { const std::valarray<float> n{-2.f, -1.f, 0.f, 1.f, 2.f, 3.f, INFINITY}; const std::valarray<float> pow10{std::pow(10.f, n)}; const std::valarray<float> log10_pow10{std::log10(pow10)}; show("n ", n); show("10â¿ ", pow10); show("lg(10â¿)", log10_pow10); }
Output:
n : -2 -1 0 1 2 3 inf 10â¿ : 0.01 0.1 1 10 100 1000 inf lg(10â¿) : -2 -1 0 1 2 3 inf[edit] See also
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