<valarray>
template<class T> valarray<T> pow (const valarray<T>& x, const valarray<T>& y);
template<class T> valarray<T> pow (const valarray<T>& x, const T& y);
template<class T> valarray<T> pow (const T& x, const valarray<T>& y);
Compute power of valarray elements
Returns a valarray object containing the results of the power operation on all the elements. The results calculated are x raised to the power y (xy).
This function overloads cmath's pow function.
Parameters
- x
- valarray or element with the base for the power operations.
- y
- valarray or element with the exponent for the power operations.
Return value
A valarray object with the values of x to the power of y.
Example
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// pow valarray example
#include <iostream>
#include <cmath>
#include <valarray>
using namespace std;
int main ()
{
valarray<double> val (5);
valarray<double> results;
for (int i=0; i<5; ++i) val[i]=i+1;
cout << "val: ";
for (size_t i=0; i<val.size(); ++i) cout << val[i] << ' ';
cout << endl;
results = pow (val,val);
cout << "val^val: ";
for (size_t i=0; i<results.size(); ++i) cout << results[i] << ' ';
cout << endl;
results = pow (val,2.0);
cout << "val^2: ";
for (size_t i=0; i<results.size(); ++i) cout << results[i] << ' ';
cout << endl;
results = pow (2.0,val);
cout << "2^val: ";
for (size_t i=0; i<results.size(); ++i) cout << results[i] << ' ';
cout << endl;
return 0;
}
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Output:
val: 1 2 3 4 5
val^val: 1 4 27 256 3125
val^2: 1 4 9 16 25
2^val: 2 4 8 16 32
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See also
| log | Compute natural logarithm of valarray elements (function template) |
| exp | Compute exponential of valarray elements (function template) |
| sqrt | Compute square root of valarray elements (function template) |
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