Calculate Dirac function.
Dirac function \(\delta(x)\) defined as \(\delta(x)=1\) if x=0,
0 otherwise.
- Parameters:
x (number of array_like) – A real number or sequence of real numbers.
- Returns:
delta – 1 or 0.
- Return type:
number of array_like
References
https://en.wikipedia.org/wiki/Dirac_delta_function