How can I save a series of variables in workspace to a txt file?

Hi all,

I want to save a bunch of variables (data1, data2 etc) to a textfile (alldata.txt). The code below is a simplified version but it makes the problem clear, since the saved data in the textfile is not correct.

    data1 = 1
    data2 = 2
    data7 = 3
    data10 = 5

    for i = 1:10
        try
        fid = fopen('alldata.txt','w');
        x = (sprintf('data%d', i));
        fprintf(fid,'%d\n',x);
        fclose(fid);
        catch
            continue;
        end
    end

Tthis is the output in alldata.txt, which is wrong:

100
97
116
97
49
48

Is there anybody who can help me?

ps. I dont want to make use of the option: save() with the -ascii flag, because I want to be able to do some text formatting.

Answer 1

[Walter Roberson]

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

Answer 2

[dpb]

      data1 = 1;
    data2 = 2;
    data7 = 3;
    data10 = 5;

Don't do this; as you've discovered "there be dragons". Use

data=zeros(10,1);   % set size as needed...
data(1)=1;
data(2) = 2;
data(7) = 3;
data(10) = 5;

instead. Then write the array members desired.

Or, of course, if there are a large number of missing indices, you can use named fields in a structure to provide specific ones instead of a full array.

Matlab works best if you don't try to create such named variables as you show initially--falling into the (common; don't think you're the only/first with the above idea) trap above is counterproductive in almost every case.

[Marty Dutch]

It works now. The code below does what I need it to do! Import data stored in txt files, then calculate the mean, and put these in one matrix.

 clear all
  clc

fileDirectory = '/dir'; %directory containing .txt files
files = dir(fullfile(fileDirectory,'*.txt'));

disp(numel(files)); %display filenames

for i = 1 : numel(files)
   fileNameIn   =   files(i).name;
   data = load (fileNameIn);
   disp(fileNameIn);
   t(i, 1:1)  = mean(data);
   end;