MATLAB: Create a new file

writing to file

>> fid=fopen('firstone.txt''w')

fid =

-1

>> fid=fopen('firstone.txt','w')

fid =

>> for i=1:3 fprintf(fid,'The loop variable is %d\n', i) end

ans =

>> fclose(fid)

ans =

>> while~feof(fid)

aline=fget1(fid)

end

??? Error using ==> feof Invalid file identifier. Use fopen to generate a valid file identifier.

>> fid=fopen('firstone.txt')

fid =

>> while~feof(fid)

 aline=fget1(fid)
 end   
??? Undefined function or method 'fget1' for input arguments of type 'double'.

What went wrong and I also wonder if the three answers equal 23 after creating the text means that anything is wrong?

Best Answer

The routine name is fgetl ending with a lower-case L, not fget1 ending with the digit One.

The 23 just means that fprintf() wrote 23 characters to the file.

Related Solutions

MATLAB: Differnce between fgetl and fgets

The results are very similiar. Using your method the difference is hard to see, because the line break appears at the end of the line as line break directly followed by a line break.

Better check this by a numerical display of the ASCII values:

fid = fopen('sweden.se', 'r')
while ~feof(fid)
  s = fgetl(fid);
  % disp(s);

  disp(double(s));
end
fclose(fid);
fid = fopen('sweden.se', 'r')
while ~feof(fid)
  s = fgets(fid);
  % disp(s);
  disp(double(s));
end
fclsoe(fid);

You can read the source of the file fgetl.m to see, what happens.

MATLAB: Concatenate data using fgets

You are closing the file in the loop. close the file after the loop. I assume the below should work.

function read_datapattern(filename)
fid = fopen(filename,'rt');
if fid < 0
  error('error opening file %s\n\n',filename);
end
pattern = fgets(fid);
for n = 1:32767
  nextline = fgets(fid);
  pattern = strcat(pattern, nextline);
fprintf(pattern);
fprintf('\n');
end
fclose(fid);

Best Answer

Related Solutions

MATLAB: Differnce between fgetl and fgets

MATLAB: Concatenate data using fgets

Related Question