display file function crash

%I want to display a file and according to the book, I wrote the display file function like below, but it always showed that 'something wrong happen'. I have no idea which I part I did the wrong programming.%

function DisplayFile(filename)
try
    fid=fopen(filename);    
    if fid == -1
        disp(sprintf('Unable to open file ''%s'' ',filename));
    else
        while ~feof(fid)      
            tline = fget1(fid);  
            disp(tline);
        end
        fclose(fid);
    end
catch
    fclose(fid);
    disp('Something wrong happened');
end

[Steven Lord]

Show us exactly how you call this function. What are you passing into it as input?

[Yu Liu]

Hello Steven, the function reads a text file and displays it on the command window. The input is the name of an existing file.

Answer 1

[Daniel M]

try
  % some code here
  x = 1:5;
  for n = 0:4
    y = x(n); % can't access x at position zero!
  end
catch ex
  % some code to handle it
  errorlog = n;
  rethrow(ex) % throw the error to view message
end

[Yu Liu]

Hi Daniel, Thanks for your answer! I tried the codes and it returned 'Subscript indices must either be real positive integers or logicals'. I still have no idea which part goes wrong. Do you have any idea about it?

[Daniel M]

If you run the above code in a script the error it throws should be:

Array indices must be positive integers or logical values.

Error in untitled27 (line 5)

y = x(n); % can't access x at position zero!

This tells you exactly what part goes wrong and where.