Sorting distance traveled by timestamps

Question

Zachary Wayne Liesemeyer 2019-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/495296-sorting-distance-traveled-by-timestamps

评论： Zachary Wayne Liesemeyer 2019-12-6

I am working on extracting distance traveled with timestamps from a json file from google maps timeline data.. i have first extracted the data and ran the lat and long data through dist11km tool box to find distance treaveled between each timestamp.

now i want to sum each days travel distance and plot for each day of the week. I was working on this to to sum the distance per day. The problem is that I I am finding the temp array empty and so I am not getting any data. how should I modify this to save the find into temp and run through the sum(d2km(temp))?

for j=1:22831
   temp=find(single(datenum(projecttime(1,j)))>=single(datenum('01-Sep-2019 00:00:00'))...
    &single(datenum(projecttime(1,j)))<=single(datenum('02-Sep-2019 00:00:00')));
   dailydis1=sum(d2km(temp));
        
 end

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Answer 1

Guillaume 2019-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/495296-sorting-distance-traveled-by-timestamps#answer_405226

So, you've got easy to use datetime in your array and you go and convert to harder to use datenum and then to single. Why?

The easy way to do what you want is to store all three variables in a timetable and then retime it. I'm unclear why your projecttime has one more element than the other two, I'm discarding the last here:

traveleddistance = timetable(projecttime(1:end-1)', d1km(:), d2km(:), 'VariableNames', {'d1km', 'd2km'});
dailytravel = retime(traveleddistance, 'daily', 'sum')

Done!

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Zachary Wayne Liesemeyer 2019-12-6

thank you for the elegant code! i really appreaciate you convering answering this so quickly. the method I was using was suggested by my instructor and the date to num then string were my modfications.

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