Determine what the delimiter of your text file is. Space, tab, comma, etc. Then read the text file with one of the Matlab text reading functions.
Here is some example code tailored to your use case.
% delim = ' '; % space delimited
delim = '\t'; % tab delimited
% delim = ','; % comma delimited
fid = fopen('data.txt'); % open file
dataIn = textscan(fid,'%s %n','Delimiter',delim); % read file
fclose(fid); % close file
% dataIn{1} contains dates as char arrays
% dataIn{2} contains values as doubles
% convert to matlab date numbers
myDates = datenum(dataIn{1},'yyyy-mm-dd');
disp(datestr(myDates)); % Display datenumbers as strings
You can use date numbers for the x-axis of your plot.
plot(myDates,dataIn{2});
datetick;
Hope this helps.
