Read the data from specific line from multiple files.

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Tez 2017-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/348923-read-the-data-from-specific-line-from-multiple-files

评论： Tez 2017-7-17

mvn_kp_insitu_20150202_v10_r01.zip

I have sequence of data files(".tab" files), each file with more than 11100 rows and 236 columns. In each file first few lines are headerlines and I have to skip those lines. The data begins from different lines in each file. How can I read only the data values from all the files upto the end of file? Also I have to read some of the variable columns from all the files. How can it be done? I had written a code for it. But it does not work properly. It takes too much time to run the program and the variable values are not taken. I am attaching one of my file here.

{{
clear all;
clc;
files=dir(fullfile('C:\Users\Documents\MATLAB\2015\02\*.tab'));
for i=1:28
  fid(i)=fopen(files(i).name);
  files(i).values=textscan(fid(i), '%s','delimiter','','HeaderLines',296,'MultipleDelimsAsOne',1);
formatSpec='%19s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%16s%s%[^\n\r]';
  dataArray = textscan(files(i).name,formatSpec, 'Delimiter', '', 'WhiteSpace', '',  'ReturnOnError', false);
  raw = repmat({''},length(dataArray{1}),length(dataArray)-1);
  for k=1:11900;l=1:236;
      raw(k,l) = raw(length(dataArray{1}),length(dataArray)-1);
      n = str2double(raw(:, 2));
      h = str2double(raw(:, 197));
  end
      fclose('all');
end
}

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Tez 2017-7-17

All the files in the folder are opened. Each file has 236 columns and each column contain both NaN and numerical values.But the variables(eg: n,h) in the columns shows only NaN while running the code. I have to read some of the variable columns (eg: columns 2, 5,197 etc)from each file. What should I do for it?

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