I see a lot of unaccepted answers in your post posting history. You might want to accept some of them to award the people who helped you "reputation points."
This works:
data = readcell('Freq_complex.txt')
[rows, columns] = size(data)
counter = 0;
for row = 1 : rows
thisCellContents = data{row, 1};
if contains(thisCellContents, 'Freq')
% Skip a text line in the middle of all the data.
continue;
end
counter = counter + 1;
column1(counter) = str2double(thisCellContents(1:21));
column2(counter) = str2double(thisCellContents(23:end-1));
column3(counter) = data{row, 2};
end
fprintf('Done parsing %d lines of data to get %d numbers per vector.\n', rows, counter)
