When you make a tall array from a fileDatastore, the resulting tall array is a tall cell array. CELL2UNDERLYING converts that tall cell array to a tall array of the underlying data. For example, if your fileDatastore returns a table for each file that it reads, then a tall array based on that fileDatastore would be a tall cell array where each cell contained a table. Using CELL2UNDERLYING would convert that to a tall table.
MathWorks Parallel Computing Toolbox Team (2021). cell2underlying for tall arrays (https://www.mathworks.com/matlabcentral/fileexchange/61517-cell2underlying-for-tall-arrays), MATLAB Central File Exchange. Retrieved .
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