display file function crash

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Yu Liu
Yu Liu 2019-10-20
评论： Yu Liu 2019-10-22
%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
  2 个评论
Steven Lord
Steven Lord 2019-10-21
Show us exactly how you call this function. What are you passing into it as input?
Yu Liu
Yu Liu 2019-10-22
Hello Steven, the function reads a text file and displays it on the command window. The input is the name of an existing file.

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回答（1 个）

Daniel M
Daniel M 2019-10-20
编辑：Daniel M 2019-10-20
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
  2 个评论
Yu Liu
Yu Liu 2019-10-21
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
Daniel M 2019-10-21
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.

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