Do a loop with a restriction in a duration array

Question

flashpode 2022-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/1640875-do-a-loop-with-a-restriction-in-a-duration-array

编辑： VINAYAK LUHA 2023-12-5

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

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Geoff Hayes 2022-2-1

But how does an index tell you what time it is? Or do you have one record for each second? Or minute?

flashpode 2022-2-1

Yeah, I upload a variable called Time that has all the diferent times from the messages

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Answer 1

VINAYAK LUHA 2023-12-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1640875-do-a-loop-with-a-restriction-in-a-duration-array#answer_1365704

编辑：VINAYAK LUHA 2023-12-5

在 MATLAB Online 中打开

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-

Create an array "lower_bounds" that holds timestamps for each 10-minute interval.
Then, initialize two variables "x" and "y" to point to the lower and upper indices of data corresponding to any specific 10-minute interval.
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.
Update the value of "y" to be "index-1" and retrieve the data using array slicing.
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