Test if arguments of the function are all variables (workspace variables names). Return 1 if yes, 0 if no.
For example :
a=1;
b=2;
c=3;
Easy ?
length!! and not "not isempty"... good point!
http://de.mathworks.com/matlabcentral/cody/problems/3031-expression-or-variable/solutions/608839
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