How to select rows from a log file?

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AbelM Kusemererwa 2015-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/231188-how-to-select-rows-from-a-log-file

评论： AbelM Kusemererwa 2015-7-25

https://drive.google.com/file/d/0B4opCeiIoNAMTE9rTW9adVNNV0E/view?usp=sharing The link contains codes and 3 files(1 is a txt file and 2 & 3 are log files). File 1 is processed by button 1 whiles file 2 and 3 are processed by button 23. When button 23 is pressed it gives the opportunity for button 2 and 3 to be displaced for the respective files to be opened and read. However, I am having errors.

What I wanted to do was that for each case read the corresponding file and save them in columns (columns 1 to 15). Making sure that only rows with $GNGGA are read and saved in the case 3.

What codes do I need to select rows with $GNGGA?