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log10 (<valarray>)

Operates on the elements of an input valarray, returning a valarray whose elements are equal to the base 10 or common logarithm of the elements of the input valarray.

template<class Type> 
   valarray<Type> log10( 
      const valarray<Type>& _Left 
   );

_Left

The input valarray whose elements are to be operated on by the member function.

A valarray whose elements are equal to the common logarithm of the elements of the input valarray.

// valarray_log10.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>
#include <iomanip>

int main( )
{
   using namespace std;
   int i;

   valarray<double> va1 ( 11 );
   for ( i = 0 ; i < 11 ; i++ ) 
      va1 [ i ] =  10 * i;
   valarray<double> va2 ( 9 );

   cout << "Initial valarray:";
   for (i = 0 ; i < 11 ; i++ )
      cout << " " << va1 [ i ];
   cout << endl;

   va2 = log10 ( va1 );
   cout << "The common logarithm of the initial valarray is:\n";
   for (i = 0 ; i < 11 ; i++ )
      cout << va2 [ i ] << endl;
}
Initial valarray: 0 10 20 30 40 50 60 70 80 90 100
The common logarithm of the initial valarray is:
-1.#INF
1
1.30103
1.47712
1.60206
1.69897
1.77815
1.8451
1.90309
1.95424
2

Header: <valarray>

Namespace: std

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