inserting headline in matlab exporting file - matlab

Question

I have a matrix (input) and want to export it as a text file (output), therefore, I am using the following code in matlab:
save('out.txt', 'input', '-ASCII');
My question is that how I can insert for example 3 lines (as follow) for its header? I don't want to open the output.txt file in another program, because the size of the output.txt is very large and non of the available softwar can open it. Therefore, I want to do this directly in matlab.
These data set are...
It is created by
2013

Answer 1

I think you cannot do it using only save function. For a quick, I can see two options that might be useful.
First. Create a file with the header and then use save with -append options:
input = rand(5);
header = ['These data set are It is created by 2013'];
fileID = fopen('out.txt','w');
fprintf(fileID,'%s\n', header);
fclose(fileID);
save('out.txt', 'input', '-ASCII', '-append');
Second. Instead of using save, manually use fprintf to write everything:
input = rand(5);
header = ['These data set are It is created by 2013'];
fileID = fopen('out.txt','w');
fprintf(fileID,'%s\n', header);
fprintf(fileID,[repmat('%f ', [1, size(input, 2)]),'\n'], input);
fclose(fileID);
If u want multi-line header, u can do as follows:
header = ['These data set are ...\nIt is created by\n2013'];
fileID = fopen('out.txt','w');
fprintf(fileID, [header, '\n']);
fprintf(fileID,[repmat('%f ', [1, size(input, 2)]),'\n'], input);
fclose(fileID);