MATLAB: Read data from delimited text file

dlmreadMATLABnestedloops

Hi,
I have a delimited text file that contains 8 rows and 4 columns and this is repeated for 'n' sets. I need to copy the 4th column value of each rows and make a new variable.
There will be a total of 8 variables with dimension (n,1).
I can use dlm read to read the file. But I am having trouble creating nested loops to achieve the goal.
I have attached the text file for reference. What would be the best way to tackle the problem ?

Best Answer

This is one of the more difficult files I have managed to import!
See if this does what you want: 
fidi = fopen('water.txt');
for k = 1:3
    hdr{k,:} = fgets(fidi);                         % Read & Store Header Lines
end
k1 = 1;
while ~feof(fidi)
    sechdr(k1,:) = textscan(fidi, '%f%f',1);
    if isempty(sechdr)
        break
    else
        for k2 = 1:8
            secline(k2,:) = textscan(fidi, '%f%f%f%f%f',1);
        end
        secdata{k1} = cell2mat(secline);
        k1 = k1+1;
    end
end
fclose(fidi);
with: 
hdr_1 = sechdr(1,:)                                 % Display Data (Delete)

data_1 = secdata{1}
hdr_LastFull = sechdr(k1-2,:)                       % Display Data (Delete)
data_LastFull = secdata{k1-2}
producing: 
hdr_1 =
  1×2 cell array
    {[5000]}    {[8]}
data_1 =
   1.0000e+00   1.6087e-07   2.0500e-01   8.4682e-02   2.8968e-01
   2.0000e+00   5.3421e-02   1.0823e-01   1.0074e-02   1.7172e-01
   3.0000e+00   3.7223e-02   1.2488e-02   2.2847e-02   7.2557e-02
   4.0000e+00   2.0605e-01   2.9866e-02   1.9402e-01   4.2994e-01
   5.0000e+00   1.4819e-01   4.3587e-02   5.9918e-02   2.5170e-01
   6.0000e+00   6.4602e-02   1.2636e-01   1.2115e-02   2.0308e-01
   7.0000e+00   3.7825e-01   2.5960e-01   1.9181e-01   8.2967e-01
   8.0000e+00   1.1831e-02   3.4485e-02   3.8945e-02   8.5260e-02
hdr_3219 =
  1×2 cell array
    {[3223000]}    {[8]}
data_3219 =
   1.0000e+00   6.1856e-05   2.4395e+01   1.8241e+01   4.2636e+01
   2.0000e+00   5.7546e+00   4.7172e+01   1.0499e+01   6.3425e+01
   3.0000e+00   9.7735e+00   4.3917e+01   3.9653e+01   9.3343e+01
   4.0000e+00   2.5318e+00   3.9988e+01   3.5174e+00   4.6038e+01
   5.0000e+00   7.7347e+00   1.4633e+01   6.8984e+00   2.9266e+01
   6.0000e+00   5.2029e+00   3.6422e+01   8.2238e+01   1.2386e+02
   7.0000e+00   3.1026e+01   1.0219e+01   3.8708e-02   4.1284e+01
   8.0000e+00   2.0353e-01   3.2281e+00   8.1987e+00   1.1630e+01
The ‘hdr’ cell array are the first 3 header lines in the file. The ‘sechdr’ cell array are the first row of each section, and ’secdata’ are the matrix following it.
.
Related Question