reading a text file

Hi,

I am trying to read a text file having 11 headerlines at the beginning and 30 rows of numberical data (in 4 different columns). I want to skip l0 lines and read every other line. The code is as such: clc filename='sample4.txt'; StartLine=11; %to skip the headers

fclose('all'); fid1 = fopen(filename); if fid1 == -1 disp(' ') disp('Operation was unsuccessful - Check the filename')

    return
end

for k=1:StartLine-1 tline=fgetl(fid1); end

k=1; while ~feof(fid1)

   for i = 1:10
     d = fgets(fid1);
     if isempty(d)|| ~ischar(line), break,end
 end 
 %
   % d = fgetl(fidl);
    numline(1:4) = str2num(d);
    R=numline(1);
    Z=numline(2);% 2nd column
    Y=numline(3);% 3nd column
    X=numline(4);% 4th column
      %tline = fgetl(fidl);
end

fclose(fid1);

Now my problem is that when I run the code I get this message: Which is as I believe, is happening from the loop. ??? Error using ==> str2num Requires string or character array input.

Error in ==> G:\Simulation\trail_RLE.m On line 31 ==> numline(1:4) = str2num(d);

Can someone help me please show me how to terminate the loop when the code reaches the end of the file??

AA

Answer 1

[Walter Roberson]

fgets() does not return empty at end of file: it returns -1.

Your existing code does not catch that because the ischar() is being applied to "line" not to "d". (I don't see where "line" is defined?)