How to print 1x50 array into a text file

Hello,

I have 1x50 array A=[0.020 0.600 49.915 0.000 0.100 0.000 30.910 51.340 30.850 .... 0.000]

and want to print them into a text file with the below format.

     0.020     0.600    49.915     0.000     0.100     0.000    30.910    51.340
    30.850    51.460    13.378     4.600     0.000     0.000     0.000     0.000
     0.000     0.000     0.000     0.000     0.000     0.000     0.000     0.000
     0.000     0.000     0.000     0.000     0.000     0.000     0.000     0.000
     0.000     0.000     0.000     0.000     0.000     0.000     0.000     0.000
     0.000     0.000     0.000     0.000     0.000     0.000     0.000     0.000
     0.000     0.000

How should I do this?

[Jan]

And what exactly is the "below format"? Do you want spaces or tab stops between the numbers? Tab stops before the line breaks? A fixed number of 8 columns, or does this depend on the number of elements? A trailing linebreak or not? 10 characters per number and 3 digits after the point? Please mention the details.

Answer 1

[Jan]

Maybe:

[fid, msg] = fopen(FileName, 'w');
assert(fid ~= -1, 'Cannot open file for writing: %s\n%s\n', FileName, msg);
fmt = [repmat('%10.3f', 1, 8), '\n'];
fprintf(fid, fmt, A.');
fclose(fid);

[Iman Baz]

Works perfectly! Thanks.

Answer 2

[Akira Agata]

How about the following?

dlmwrite('output.txt',reshape(A(1:48),8,6)','delimiter','\t');
dlmwrite('output.txt',A(49:50),'-append','delimiter','\t');

[Iman Baz]

Dear Agata,

Thank you for your prompt reply. that's worked.

but I need numbers in format %10.3f.

[Akira Agata]

Dear Hossein-san,

Thank you for your comment.

Sorry, I've missed your 'fprintf' tag in your original post.

Just FYI, your can save as %10.3f format by dlmwrite function, too, by:

dlmwrite('output.txt',reshape(A(1:48),8,6)','delimiter','\t','precision','%10.3f');
dlmwrite('output.txt',A(49:50),'-append','delimiter','\t','precision','%10.3f');

Answer 3

[Raj]

Answer given by Akira is the optimal solution but since you have mentioned 'fprintf' as a tag, here are two ways to get what you want using 'fprintf'

fid=fopen('MyFile.txt','w'); % Open text file
fprintf(fid, '%10.3f %10.3f %10.3f %10.3f %10.3f %10.3f %10.3f %10.3f\r\n',A); % Write 8 elements in each line from A with 3 digits after decimal
fclose(fid); % Close the file

or an even weird way:

fid=fopen('MyFile.txt','w');
for i=1:numel(A)
    if rem(i,8)~=0
      fprintf(fid, ' %10.3f',A(1,i));
    else
      fprintf(fid, ' %10.3f\r\n',A(1,i));
    end
end
fclose(fid); 

Good luck!!