How to open new text file and how to write on the text file using matlab code?

How to open new text file and how to write on the text file using matlab code?

PS: How to go to next line(like we use Enter to go to next line) on the text file using code....can anyone help

Answer 1

[Image Analyst]

Try something like this

fid = fopen(filename, 'wt');
if fid ~= -1
    fprintf('This is line 1.  Backslash n makes a new line.\n');
    fprintf('My result is %f\n, result);
    fprintf('My string = %s\n', myString);
    fclose(fid);
else
    warningMessage = sprintf('Cannot open file %s', filename);
    uiwait(warndlg(warningMessage));
end

[peyush]

after using the below code,no text file named result.txt opens why?

fid = fopen('result.txt', 'wt');
if fid ~= -1
  fprintf('This is line 1.  Backslash n makes a new line.\n');
  fprintf('My result is %f\n, result');
  fprintf('My string = %s\n', 'hello');
  fclose(fid);
else
  warningMessage = sprintf('Cannot open file %s', filename);
  uiwait(warndlg(warningMessage));
end

[Image Analyst]

Because I forgot to put fid as the first argument of fprintf. Fix is:

fid = fopen('result.txt', 'wt');
if fid ~= -1
  fprintf(fid, 'This is line 1.  Backslash n makes a new line.\n');
  result = 42;
  fprintf(fid, 'My result is %f\n', result);
  fprintf(fid, 'My string = %s\n', 'hello');
  fclose(fid);
else
  warningMessage = sprintf('Cannot open file %s', filename);
  uiwait(warndlg(warningMessage));
end

[peyush]

thanks but, how to clear all the characters(everything) from the text file?

[Image Analyst]

Try this and see if it works:

delete(filename);
fid = fopen('result.txt', 'wt');
if fid ~= -1
  fclose(fid);
else
  warningMessage = sprintf('Cannot open file %s', filename);
  uiwait(warndlg(warningMessage));
end

[Walter Roberson]

It should not be necessary to delete the file. Opening with 'w' should remove the previous content. (To update a file, open it with 'a' instead of 'w'; when you open with 'w' you might have to fseek() to the beginning of the file to read it.)

[Image Analyst]

But if you want extra safety and security of saving the old version in the recycle bin instead of blowing it away forever, do this:

recycle on;
delete(filename);

[peyush]

thanks