Question

I am relatively new to using Matlab and I don’t have much knowledge about programming either. For a project I am working on currently I need to process a lot of data which is logged using the following format.

$GPRMC,202124.985,V,,,,,,,091112,,,N*44
2038,4674,4667,5593,3379
2087,5133,5111,6084,3372
2138,5134,5114,6080,3376
2188,5133,5114,6084,3377
2238,5130,5113,6084,3410
2287,5134,5113,6080,3416
2337,5133,5110,6080,3417
2387,5133,5110,6084,3416
2438,5130,5113,6081,3396
2487,5132,5110,6080,3410
$GPRMC,202125.985,V,,,,,,,091112,,,N*45
2985,5130,5113,6085,3988
3035,5130,5118,6084,4541
3085,5138,5113,6082,5186
3135,5130,5114,6081,6001
3185,5134,5110,6084,6311
3234,5134,5113,6084,6319
3284,5131,5114,6084,6316
3339,5131,5110,6084,6260
3389,5130,5114,6080,6178
3438,5134,5110,6085,6077
$GPRMC,202126.985,V,,,,,,,091112,,,N*46
3942,5131,5114,6085,5916
3992,5130,5110,6084,5917
4042,5133,5110,6084,5950
4091,5131,5114,6080,5996
4142,5134,5114,6085,6062
4192,5134,5114,6084,6129
4242,5134,5110,6080,6150
4291,5130,5110,6079,6186
4341,5130,5110,6089,6246
4391,5130,5118,6083,6266

It continues like this until the end of the file. What I want to do is to be able to separate the data such that, all the ‘$GPRMC’ strings (rows) are listed together as text (not separated) in one file or array while all the other rows (numerical) listed together in one file array (comma separated is desirable). Is it even possible? If it is than can you please give me some pointers?

Answer 1

Not quite sure what you mean by separated or not separated. If you copy the text you posted into some file like testf.dat, a simple script like this using fopen, fprintf, and fgets might be what you’re looking for:

infile = fopen('testf.dat');                                                        
outf1 = fopen('GPRMC.dat','w');                                                 
outf2 = fopen('nums.dat','w');                                                  

tline = fgets(infile);                                                          
while ischar(tline)                                                             
    if tline(1:6) == '$GPRMC'                                                   
        fprintf(outf1,tline);                                                   
    else                                                                        
        fprintf(outf2,tline);                                                   
    end                                                                         
    tline = fgets(infile);                                                      
end                                                                             

fclose(infile);                                                                 
fclose(outf1);                                                                  
fclose(outf2);