Matlab's isempty() returns false for a structured variable that contains one or more fields. In some circumstances, however, a structured variable may have been initialised with empty fields to be populated later; in this case, we might want to consider the structure to be empty if the fields themselves are empty.
isemptyr() tests for this condition by recursively checking the fields of a structured variable, returning true if only empty fields are found.
Similarly, for cell arrays, Matlab's isempty() returns false if the array contains one or more cells, even if they are empty. isemptyr(), in contrast, searches the cell array recursively, returning true if only empty cells are found.
isemptyr() works just like Matlab's isempty() for normal arrays and strings.
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