- `Y = exp (X)`

Compute `%e^x%` for each element of `X`.

See also: `log`.

### References

- https://www.mathworks.com/help/matlab/ref/exp.html
- https://octave.sourceforge.io/octave/function/exp.html
- https://mathworld.wolfram.com/ExponentialFunction.html
- https://en.wikipedia.org/wiki/Exponential_function