How to read files of different types?

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AbelM Kusemererwa 2015-7-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/230539-how-to-read-files-of-different-types

编辑： AbelM Kusemererwa 2015-7-24

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). I intend to input file name without without the file extension. 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 $GPGGA are read and saved in the case 1 and case 2. Whiles $GNGGA are read and saved in the case 3. Also in the codes, I used the for loop to select either $GNGGA or $GPGGA and also remove empty cells

Case 1 will be used to processes 1.txt file, case 2 for 2.log and case 3 for*3.log*.

These 3 files would be processed one at a time and I want it to be read so that all columns of the file being processed are saved.

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Stephen23 2015-7-21

Given that the "log" files are most likely text then you could have simply changed their file extension to .txt and uploaded them with the paperclip button.

AbelM Kusemererwa 2015-7-24

I wanted to read the log file and work with it like the txt file

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采纳的回答

Walter Roberson 2015-7-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/230539-how-to-read-files-of-different-types#answer_186657

在 MATLAB Online 中打开

fileID = fopen(filename,'r');

not

fileID = fopen('filename','r');

Your code also makes use of variables named things like col1 and col3, without having created those variables in any obvious way.

In your 1.txt file you have multiple different line formats, which makes it more difficult to process them automatically. Are there specific columns you need no matter what the string in the first field is?

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Walter Roberson 2015-7-21

在 MATLAB Online 中打开

datastring = fileread(textfile);
splitlines = regexp(regexp(datastring, '^\$GPGGA,.*$', 'match', 'lineanchors', 'dotexceptnewline').', ',', 'split');
GPGGA = vertcat(splitlines{:});

Now co11 = GPGGA(:,1); col2 = GPGGA(:,2); and so on, as cell array of strings. You can str2double(GPGGA(:,2)) to get the numeric values (without the leading 0's)

AbelM Kusemererwa 2015-7-24