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Do a loop with a restriction in a duration array

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Hi I've got a code I want to run it within a time. When the messages are inside a ran of time I want to run my code.
First I want to run all the messages that are in the first 10 mins then the messages that are within the min 10 and 20. This till the end of the duration variable(1 day).
I post the code and the variables:
lat1 = [];
lon1 = [];
D = minutes(0:10:1439);
D = duration(D,"Format","hh:mm:ss"); %this was created because I thought I could do it with this variable
a = length(D)
for i=1:1:L
seq1 = msg_NoMatchAIS1(i);
linia=convertStringsToChars(seq1);
if linia(13)=='A' && linia(15)=='1'
sequencia = ais_to_bit(linia(15:44));
s_longitud=sequencia(62:89);
longitud = bin2dec(num2str(s_longitud))/600000; % en graus
lon1 = [lon1, longitud];
s_latitud=sequencia(90:116);
latitud = bin2dec(num2str(s_latitud))/600000; % en graus
lat1 = [lat1, latitud];
end
end
than you in advance
  4 Comments
Geoff Hayes
Geoff Hayes on 1 Feb 2022
But how does an index tell you what time it is? Or do you have one record for each second? Or minute?
flashpode
flashpode on 1 Feb 2022
Yeah, I upload a variable called Time that has all the diferent times from the messages

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Answers (1)

VINAYAK LUHA
VINAYAK LUHA on 5 Dec 2023
Edited: VINAYAK LUHA on 5 Dec 2023
Hi Flashpose,
I understand that you have an array of strings called "msg_NoMatchAIS1short". The indices of this array maps to the timestamps stored in the array called "Time_NoMatchAIS1" array. Further you want to batch process the strings based on 10-minute intervals.
Follow the below steps to batch process the strings every 10-minute interval based on timestamps in the "Time_NoMatchAIS1" array-
  1. Create an array "lower_bounds" that holds timestamps for each 10-minute interval.
  2. Then, initialize two variables "x" and "y" to point to the lower and upper indices of data corresponding to any specific 10-minute interval.
  3. Iterate over the length of the "lower_bounds" array and retrieve the index where the timestamp is just higher than the "lower_bound" for that iteration.
  4. Update the value of "y" to be "index-1" and retrieve the data using array slicing.
  5. Update the value of "x" to be "y"+1.
Below is the code snippet implementing the described steps:
durations = Time_NoMatchAIS1;
lower_bounds = minutes(10:10:60);
x = 1;
y = 1;
% Find the indices where lower bounds occur
for i = 1:length(lower_bounds)
index = find(durations > lower_bounds(i), 1);
disp(lower_bounds(i));
y = index-1;
Intervaldata = msg_NoMatchAIS1short(x:y);
x =y+1;
%code to process the data goes below
end
Hope this helps you to batch process the strings every 10-minute interval based on timestamps in the "Time_NoMatchAIS1" array.
Regards,
Vinayak Luha

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