<complex>
template<class T> T arg (const complex<T>& x);
Return phase angle of complex
Returns the phase angle (or angular component) of the complex number x, expressed in radians.
The phase angle of a complex number is the angle the theoretical vector to (real,imag) forms with the real axis (i.e., its arc tangent). It returns the same as:
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atan2(x.imag(),x.real());
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Parameters
- x
- Complex value.
Return value
Phase angle of x.
T is x's complex template type (i.e., its value type).
Example
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// arg complex example
#include <iostream>
#include <complex>
using namespace std;
int main ()
{
complex<double> mycomplex (3.0,4.0);
cout << "The polar form of " << mycomplex;
cout << " is " << abs(mycomplex) << "*e^i*" << arg(mycomplex) << "rad" << endl;
return 0;
}
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Output:
The polar form of (3,4) is 5*e^i*0.927295rad
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See also
| abs | Return absolute value of complex (function template) |
| polar | Return complex from polar components (function tempalte) |
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