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function [str] = timestrForFile( num )
% generate a timestamp for file
% this time stamp has eliminated charactors forbidden in filename
% num is a num for time stamp, now is the default.
if nargin==0
num = now;
end
timestr = datestr(num);
timestr= regexprep (timestr,':','-');
str = regexprep (timestr,'\s','-');
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