Load different files then converting them into .txt files

Hey everyone,

%%To load data from the (.mat) files and then convert them to (.txt) files

a=['20MIN_SCHJ300639_220208.mat' '20MIN_SEMS170640_040608.mat' '20MIN_SIMG200162_060208.mat'];

for i=1:3

      fid = fopen('Data%i.txt', 'w');

      load('a(i)');

      fprintf (fid, '%.9f \r\n', data_block1);

      fclose(fid);
  end

I'm having an error in load('a(i)')!! How can I make it work?

Answer 1

[per isakson]

Make a a cell array of strings:

a={'20MIN_SCHJ300639_220208.mat' '20MIN_SEMS170640_040608.mat' '20MIN_SIMG200162_060208.mat'};

for i=1:3

      fid = fopen('Data%i.txt', 'w');

      load( a{i} );

      fprintf (fid, '%.9f \r\n', data_block1);

      fclose(fid);
  end

[Yasmin Tamimi]

OK the error is gone but it only loaded and converted data from one file only!! I want to convert each .mat file into a separate .txt file.

fid = fopen('Data%i.txt', 'w'); % i here is for the looping and I guess it is not working

[F.]

   fopen( sprintf('Data%d.txt',i), 'w');

no ???

[Yasmin Tamimi]

Thankx a lot

[Yasmin Tamimi]

After running the program for 70 files:

for i=1:70

    fid = fopen( sprintf('Data%d.txt',i), 'w');

    load(a{i});

    fprintf (fid, '%.9f \r\n', data_block1);
    fclose(fid);
end

I noticed that when I write whos I get data_block1, data_block2 and data_block3,, however when i load each file alone -I chose random files for testing- I only get data_block1!! Do you know why is this happening!!

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

[Ryan]

What happens if you only load two files? (do you get data_block1 and data_block2 then?)

[Yasmin Tamimi]

I loaded each one of the files separately to find the error!! So, I found 3 files out of the 70 that contain 3 data blocks. I removed them from the cell array and loaded them by themselves. I also found another error in the way I wrote my cell array, I fixed it and finally it worked properly!!

Answer 2

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[Yasmin Tamimi]

Thanx for your posts, I am reading them.