file data error reading

I have this dataset in a txt file.

25 0.109 1
corrupted line
20 0.096 2

100 0 3
15 0.517 3

15 0.8 5

35 1.086 4
3
40 0.934 2
3 3 3 3 3 3
35 0.109 1

22 0.100 1
21 0.100 2
16 0.600 3
17 0.850 5
32 1.080 4
45 0.950 2
37 0.110 1

I want MATLAB to read the data and skip the lines where there are errors (like line 2 and 8) and then explain in which line the error occured and what error was.

I just dont know how to do it... Help plz.

Answer 1

[Geoff Hayes]

You mention that line eight should be skipped - is that because there is only one number in that line? Are valid lines only those with 3 numbers?

Once you have opened your file and ensured that the file descriptor is valid, use a while loop to iterate over each line in the file (with the condition ~feof(fid) (type help feof for details on this function). Then, for each line do something like

         % get the line
         line = fgetl(fid);

         % read the three floats into data and get the count of the number
         % of floats read
         [data,count] = sscanf(line,'%f%f%f');

         if count~=3
             fprintf('invalid line: %s\n',line);
         else
             % do something with data
         end

Try out the above and see what happens!