1. textscan

dialogtitle= 'Select file(s)';

filtspec = {‘*.txt;*.* '};

[files

folder] = uigetfile(filtspec,dialogtitle,'multiselect','on'); 

time=[];cur=[];

for i=1:length(files)

        disp([num2str(i)'/' num2str(length(files))]);

        filename=fullfile(folder,files(i));

        fid=fopen(char(filename),'r');

        A=textscan(fid,'%s %f %f');

        fclose(fid);

      time1=linspace(datenum(A{1,1}(1)), datenum(A{1,1}(end)),length(A{1,1}));

      cur1=A{1,2};

      time=[time,time1];

      cur=[cur;cur1];

end