- `Y = logspace (A, B)`
- `Y = logspace (A, B, N)`
- `Y = logspace (A, pi)`
- `Y = logspace (A, pi, N)`

Return a row vector with `N` elements logarithmically spaced from `%10^A%` to
`%10^B%`.

If the number of elements `N` is unspecified it defaults to 50.

If `B` is equal to `%pi%`, the points are between `%10^A%` and `%pi%`, _not_
`%10^A%` and `%10^pi%`, which is useful in digital signal processing.

Programming Notes: For compatibility with MATLAB®/Octave, return the
right-hand side of the range (`%10^B%`) when a single value (`%N = 1%`) is
requested. If `N` is not an integer then `floor (N)` is used to round the
number of elements. If `N` is zero or negative then an empty 1x0 matrix is
returned.

See also: `linspace`.

### References

- https://www.mathworks.com/help/matlab/ref/logspace.html
- https://octave.sourceforge.io/octave/function/logspace.html