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    %% Find Strings That Are Not Empty
% Find strings that do have characters and display only those strings.
str = string({'Amy','Charles','';...
              'Mark','','Sarah'})

%%
% Use the |~| operator to invert |tf|, so that |tf| contains |1| wherever
% |str| contains a string with more than zero characters.
tf = str=='';
tf = ~tf

%%
% Display only the strings that are not empty.
str(tf)