% Note that the armguments should be a string with single quotes.

%% whos - list variables in alphabetical order with sizes and types

whos     % list all variables in the current workspace.
      whos('t1')     % list the variable t1 in the current workspace.
      whos('t2','t3')     % list the variable t2 and t3 in the current workspace.
      whos('t*')     % list all the variables in the current workspace that start with t.

% list all the varibales contained in a file (path) and store the info in structure array S.
      S = whos('-file','/Users/Yangyang/Documents/MATLAB/raw_acs_data17.mat');

%% who - list variables in alphabetical order without sizes and types

who     % list all variables in the current workspace.
      who('t1')     % list the variable t1 in the current workspace.
      who('t2','t3')     % list the variable t2 and t3 in the current workspace.
      who('t*')     % list all the variables in the current workspace that start with t.

% list all the varibales contained in a file (path) and store the info in structure array W.
      W = who('-file','/Users/Yangyang/Documents/MATLAB/raw_acs_data17.mat');