Clears comamand window, closes all figures and clears all data
Requires KEEP.M in your path (available from Mathworks file exchange as KEEP3.M)
USAGE: fr <variables> <figures>
<variables> is a list of variables to be retained (optional)
<figures> is a list of figures to be retained (optional)
EXAMPLE: fr % Clears everything
fr a 1 b 4 % Keeps variables A and B and figures 1 and 4
fr ('a','1','b','4') % Same as above, in a parameter list form
fr ('a',1,'b',4,gcf) % Note that fr also accepts arguments of number datatype
% The number denotes figure handle
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