- `TF = isvector (X)`

Return `true` if `X` is a vector.

A vector is a 2-D array where one of the dimensions is equal to 1 (either 1xN
or Nx1). As a consequence of this definition, a 1x1 array (a scalar) is also a
vector.

See also: `isscalar`, `ismatrix`, `iscolumn`, `isrow`, `size`.

### References

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