ndims
(Not Recommended) Number of dimensions of dataset array
The dataset data type is not recommended. To work with heterogeneous data,
        use the MATLAB®
        table data type instead. See MATLAB
        table documentation for more information.
Syntax
n = ndims(A)
Description
n = ndims(A) returns the number of dimensions in the dataset
                A. The number of dimensions in an array is always 2.