function template
<valarray>
std::log10
template<class T> valarray<T> log10 (const valarray<T>& x);
Compute common logarithm of valarray elements
Returns a valarray containing the common logarithm (base-10 logarithm) of all the elements of x, in the same order.
The function calls log10 (unqualified) once for each element.
This function overloads cmath's log10.
Parameters
- x
- valarray containing elements of a type for which the unary function log10 is defined.
Return value
A valarray object with the common logarithms of the elements of x.
Example
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// log10 valarray example
#include <iostream> // std::cout
#include <cstddef> // std::size_t
#include <cmath> // std::log10(double)
#include <valarray> // std::valarray, std::log10(valarray)
int main ()
{
double val[] = {1.0, 10.0, 100.0, 200.0};
std::valarray<double> foo (val,4);
std::valarray<double> bar = log10 (foo);
std::cout << "foo:";
for (std::size_t i=0; i<foo.size(); ++i)
std::cout << ' ' << foo[i];
std::cout << '\n';
std::cout << "bar:";
for (std::size_t i=0; i<bar.size(); ++i)
std::cout << ' ' << bar[i];
std::cout << '\n';
return 0;
}
Output:
foo: 1 10 100 200
bar: 0 1 2 2.30103
See also
- log10 (cmath)
- Compute common logarithm (function)
- log
- Compute natural logarithm of valarray elements (function template)
- exp
- Compute exponential of valarray elements (function template)
- pow
- Compute power of valarray elements (function template)