Create a 3-D array with one dimension length equal to zero, and determine if it is empty.

A = zeros(0,2,2);
TF = isempty(A)

TF = logical
   1

Compare empty arrays to arrays containing missing values.

In MATLAB®, an empty array has at least one dimension length equal to zero. An array containing missing values, such as NaN or <undefined>, is not necessarily empty.

Create a categorical vector with missing values.

cat1 = categorical([missing missing])

cat1 = 1x2 categorical
     <undefined>      <undefined> 

Since cat1 does not have a dimension of length zero, it is not empty.

TF1 = isempty(cat1)

TF1 = logical
   0

Create a 0-by-0 categorical array and test if it is empty.

cat2 = categorical([]);
TF2 = isempty(cat2)

TF2 = logical
   1

Compare empty string arrays and strings with no characters.

Create a string vector whose elements are strings with no characters. str1 is nonempty since none of its dimensions have length zero.

str1 = strings(1,3)

str1 = 1x3 string
    ""    ""    ""

TF1 = isempty(str1)

TF1 = logical
   0

Create a 0-by-3 string array and test if it is empty.

str2 = strings(0,3);
TF2 = isempty(str2)

TF2 = logical
   1