- `TF = isscalar (X)`

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

A scalar is an object with two dimensions for which `size (X)` returns %%[1,
1]%%.

See also: `isvector`, `ismatrix`, `size`.

### References

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