How to read an .SRT file in order to extract data ?

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Elías Urquiza 2022-1-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622095-how-to-read-an-srt-file-in-order-to-extract-data

评论： Mathieu NOE 2022-1-4

EXAMPLE.TXT

I got data of a drone's position in an .srt file that I need to analyse. I'm attaching an example file in .txt format that shows how data is organized within.

I'm used to working with .csv files or other file formats that have some very simple delimeter to set every variable apart. However, I'm struggling with figuring out what functions should I use to read this.

I simply need to be able to extract the GPS coordinates of the drone's position. In the file, the lines where that data is located looks like this:

8
00:00:08,000 --> 00:00:09,000
HOME(-68.8723,-46.0144) 2022.01.01 11:11:11
GPS(-63.7521,-43.1158,14) BAROMETER:15.0
ISO:100 Shutter:1000 EV:+1 Fnum:2.2 

I'd need to extract the data that's located inside of GPS(...) and create Nx2 matrix that holds all the GPS coordinates of the file, where N is the number of data points.

Later on I might need to incorporate more data such as the Barometer info, but I think that if I could get some help in figuring out this part I could figure the rest out myself.

Thanks.

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Answer 1

Mathieu NOE 2022-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/1622095-how-to-read-an-srt-file-in-order-to-extract-data#answer_867730

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hello Elias

try this, hope it helps

%% read one file 
clc
clearvars
filename = 'EXAMPLE.txt';
a = readlines(filename);
% find GPS (and barometer) data 
GPS_indexes = find(contains(a,'GPS'));
for ci = 1:length(GPS_indexes)
    STR = char(a(GPS_indexes(ci)));
    ind1 = findstr(STR,"(");
    ind2 = findstr(STR,")");
    GPS_data(ci,:) = str2num(STR(ind1+1:ind2-1));
    % barometer data (on same row as GPS data)
    ind3 = findstr(STR,":");
    barometer_data(ci,:) = str2num(STR(ind3+1:end));
    
end
    
 GPS_data
 barometer_data