How to select next specific line based on string present in previous line and copy the line also from a text file?

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POKA 2017-7-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/349812-how-to-select-next-specific-line-based-on-string-present-in-previous-line-and-copy-the-line-also-fro

评论： Walter Roberson 2017-7-22

x='$RAIM';
y='$GPGGA';
fid=fopen('myfile.txt');
while ~feof(fid)
  tline = fgetl(fid);
  if contains(tline,x)
      fprintf(id,'%s\n',tline)
end
end
fclose(fid)

% Input file contents

$RAIM,002212,003080,000818,001156,020000,020000,000777,001098,111,3,11111111*32
$GPGGA,151943.50,1257.32717,N,07738.23927,E,2,09,0.87,823.3,M,,M,,*44.

if second last column of RAIM line is 5 not 3 then only select GPGGA line otherwise go to next line.

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采纳的回答

Walter Roberson 2017-7-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/349812-how-to-select-next-specific-line-based-on-string-present-in-previous-line-and-copy-the-line-also-fro#answer_275113

在 MATLAB Online 中打开

S = fileread('myfile.txt');
gpgga_lines = regexp(S, '(?<=^\$RAIM,.*,5,[^,]*$)\$GPGGA,.*$', 'match', 'lineanchors', 'dotexceptnewline');

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POKA 2017-7-22

在 MATLAB Online 中打开

%How to write two if condition in matlab
% I want to try below logic while pulling out RAIM line having 5  in 67 position
x='$RAIM'
while ~feof(fid)
tline = fgetl(fid);
if contains(tline,x) && contains(tline,tline(:,67)==5)
fprintf(fid,'%s\n',tline)
fclose(fid)

Walter Roberson 2017-7-22

在 MATLAB Online 中打开

p1 = '$RAIM'; p2 = '$GPGGA';
selecting_data = false;
while ~feof(fid)
  tline = fgetl(fid);
  if ~ischar(tline); break; end;   %end of file
  if strncmp(tline, p1, length(p1))
     selecting_data = tline(67) == '5';
     fprintf(fid, '%s\n', tline);
  elseif selecting_data && strncmp(tline, p2, length(p2))
     fprintf(fid, '%s\n', tline);
  end
end
fclose(fid);