How to calculate the duration of data points in days

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TESFALEM ALDADA 2021-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/1567378-how-to-calculate-the-duration-of-data-points-in-days

评论： TESFALEM ALDADA 2021-10-21

采纳的回答： Star Strider

pulses.txt

在 MATLAB Online 中打开

Hi,

I have a daily data series with pulses. The data is for 1 year (starts in 1st day and end 365 days) but there are NAN values between as shown in image below.

Then I want to determine individual duration and mean duration for the three pulses with data e.g the duration from a1-a2, b1-b2, and c1-c2. Since i do have alot of data of this type i wanted some kind of loop to do the problem, because manual counting takes to much time.

Can someone help me with some code to determine this? Alternatively, a different way of determining the same thing would be appreciated.

Start_Date = datenum(1995,01,01);
End_Date = datenum(1995,12,31);
YearlyVEC = datevec((Start_Date:End_Date)');

So i wanted to determine the day also from the variable YearlyVEC,

a data of the pulses is also attched below

Thanks!

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采纳的回答

Star Strider 2021-10-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1567378-how-to-calculate-the-duration-of-data-points-in-days#answer_812238

在 MATLAB Online 中打开

Try something like this —

Data = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/772213/pulses.txt');

Days = 1:numel(Data);

NaNStart = strfind(~isnan(Data(:).'), [0 1])+1;

NaNStop = strfind(~isnan(Data(:).'), [1 0]);

DiffDays = NaNStop - NaNStart;

cntr = NaNStart + DiffDays/2;

figure

plot(Days, Data)

hold on

% plot(Days(NaNStart), Data(NaNStart), '>r')

% plot(Days(NaNStop), Data(NaNStop), '<r')

hold off

grid

text(cntr, ones(size(cntr)).*min(Data([NaNStart; NaNStop])), compose('\\leftarrow %.0f Days\\rightarrow', DiffDays), 'Horiz','center', 'Vert','middle')

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Star Strider 2021-10-21

Noted!

My code worked for the example shown, however it may not be uniformly robust to all such data (as you discovered). Your modifications to it are appropriate.

TESFALEM ALDADA 2021-10-21

Yes, Thank you.

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MATLAB Language Fundamentals Data Types Dates and Time

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