MATLAB: Help definitely needed! How to load multiple txt files and change the varible names of each to include the date from file

loadrenametxt

Hey everyone,

My coding skills have clearly dies on me with this one. I have a few txt files in directory that I am using textscan to load (massive files so I want to reduce memory). I would like a loop that goes through the list, loads in data into the workspace and gives each dataset a variable name that includes the date from the file name.

My file names are like this one midas_wind_198001-198012.txt from 1979-2013.

Here is the code I have thus far for loading but I am stuck on taking it further to renaming the variables. I do not want to use EVAL for efficiency reasons and I would like each dataset to be its own variable

fid = fopen('midas_wind_197701-197712.txt', 'r'); 
C = textscan(fid,'%s %s %f %f %s %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %s %f', 'Delimiter',','); 
fclose(fid);

Thanks a lot in advance!!

Best Answer

Much better to use arrays rather than having different variable names. Have a look at structure arrays and cell arrays in the documentation.

Related Solutions

MATLAB: Help definitely needed! How to load multiple txt files and change the varible names of each to include the date from file

Masao, assuming that the only the year changes in each filename, use

 for ii = 1973:2013
   f_name   = strcat('midas_wind_',num2str(ii),'01-',num2str(ii),'12.txt');
   fid      = fopen(f_name, 'r'); 
   scan_val = textscan(fid,'%s ...   % !command cut off for readability!
   v_name   = genvarname(strcat('C',num2str(ii)));
   eval([v_name ' = scan_val';]);
   fclose(fid);
 end

MATLAB: Help with plotting needed!

Assuming that the intensities are numeric and that each element in the cell array is a matrix of 1x1000 dimension, then why not just concatenate all of the data together into a 100x1000 matrix, where each row in the matrix is the 1000 intensities for a single lund cell?

 lundCellData = zeros(100,1000);
 for k=1:100
    lundCellData(k,:) = cellArray{k}; % cellArray is the 1x100 element cell array
 end

And then just use imagesc to plot the data

 imagesc(lundCellData);

This will plot the time data along the x-axis, and the lund cell numbers along the y-axis.

Try the above and see what happens!

Best Answer

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MATLAB: Help definitely needed! How to load multiple txt files and change the varible names of each to include the date from file

MATLAB: Help with plotting needed!

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