MATLAB: Using findstr function for scanning strings in text file.

fget1findstr

2.11           OBSERVATION DATA    M (MIXED)           RINEX VERSION / TYPE
teqc  2014Jan16     NOAA/NOS/NGS/CORS   20150102 00:26:47UTCPGM / RUN BY / DATE
Solaris x86 5.10|AMD64|cc SC5.8 -xarch=amd64|=+|=+          COMMENT
teqc  2014Jan16     NOAA/NOS/NGS/CORS   20150102 00:15:53UTCCOMMENT
BIT 2 OF LLI FLAGS DATA COLLECTED UNDER A/S CONDITION       COMMENT
BRMU                                                        MARKER NAME
42501S004                                                   MARKER NUMBER
Giovanni Sella      NGS                                     OBSERVER / AGENCY
351248              LEICA GRX1200GGPRO  8.71/3.823          REC # / TYPE / VERS
00480               JAVRINGANT_DM   NONE                    ANT # / TYPE
2304703.4760 -4874817.1770  3395186.9500                  APPROX POSITION XYZ
      0.0000        0.0000        0.0000                  ANTENNA: DELTA H/E/N
   1     1                                                WAVELENGTH FACT L1/2
  10    L1    L2    L5    C1    C2    P2    C5    S1    S2# / TYPES OF OBSERV
        S5                                                # / TYPES OF OBSERV
  30.0000                                                 INTERVAL
%Above is the rinex.txt file. I need to classify how many # / TYPES OF OBSERV string exist. The below code works proper in text file if only 1 line includes # / TYPES OF OBSERV.
fide = fopen('rinex.txt')
head_lines = 0
while 1 
     head_lines = head_lines+1
     line = fgetl(fide)
      answer = findstr(line,'# / TYPES OF OBSERV')
       if ~isempty(answer) 
           break;  
       end
end
%The second # / TYPES OF OBSERV doesn't appear in line.

Best Answer

Of course, your code only finds the 1st occurence of the string. You've designed it this way:
  • read one line at a time ( fgetl(fide))
  • find the occurrences of the string in the line ( strfind(line,...)
  • if an occurrence found stop reading ( if ... break;)
If you want to find all the occurrences in the whole file, then read the whole file at once:
filecontent = fileread('rinex.txt');
noccurrences = numel(strfind(filecontent, '# / TYPES OF OBSERV'));
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