How to delete repeating header lines from text file

I have a text file consisting of a recurring sequence, made up of 4 header lines followed by 37 lines of data, then another 4 header lines, and so on (see attached txt file). One complication is that each set of headers is slightly different since it incorporates varying numbers. I want to delete all of these header lines and be left with the remaining data.

Answer 1

[Star Strider]

There is no end-of-file in the file you posted. Normally, I would use this code:

fidi = fopen('Bruno Rodriguez a160628.dat','r');
k1 = 1;
while ~feof(fidi)
    data(k1) = textscan(fidi, repmat('%f',1,20), 'HeaderLines',4, 'CollectOutput',1, 'EndOfLine','\r\n');
    fseek(fidi,0,0);
    k1 = k1 + 1;
end

With the file you posted, it is necessary to detect the last record differently. I used fgetl and strfind, copying part of the last header manually to the strfind call.

This works:

fidi = fopen('Bruno Rodriguez a160628.dat','r');
lastrecord = 0;                                                                         % Initialise ‘lastrecord’
k1 = 1;                                                                                 % Initialise Counter
while ~feof(fidi)
    data(k1) = textscan(fidi, repmat('%f',1,20), 'HeaderLines',4, 'CollectOutput',1, 'EndOfLine','\r\n');
    if lastrecord                                                                       % If Previous Was ‘lastrecord’, Stop
        break
    end
    fseek(fidi,0,0);                                                                    % Restart At New Position
    firstline = fgetl(fidi);                                                            % Read First Line
    lastrecord = strfind(firstline, 'SJSU_Sodar_DiabloCanyon 06/28/2016 23:50:00');     % Find Last Record Section
    fseek(fidi, -1, 0);                                                                 % Back Up One Line So ‘textscan’ Will Read It
    k1 = k1 + 1;                                                                        % Increment Counter
end

[Bruno Rodriguez]

Yep, this works to perfection. Thank you!

[Star Strider]

My pleasure!

Answer 2

[Walter Roberson]

Is the "SJSU" always going to be the same? If so then you could perhaps take advantage of the CommentStyle of textscan()

[Bruno Rodriguez]

Yes, the SJSU will always be the same. Is there a way to consistently delete the 3 lines after that too? I don't think I can make the assumption that the following 3 lines will start the same way each time.