Plotting two curves on a Datetime scale.

Data 1

Coloumn 1(Datetime) Coloumn 2 (Temperature)

 '2019-07-03T16:06:48'                  24 
 '2019-07-03T16:08:48'                  24 
 '2019-07-03T16:09:48'                  25 
 '2019-07-03T16:10:48'                  25 
 '2019-07-03T16:11:48'                  25 
 '2019-07-03T16:12:48'                  25 
 '2019-07-03T16:13:48'                  25 
 '2019-07-03T16:14:48'                  25 
 '2019-07-03T16:15:48'                  25 
 '2019-07-03T16:16:48'                  25 
 '2019-07-03T16:17:48'                  25 
 '2019-07-03T16:18:48'                  25 
 '2019-07-03T16:19:48'                  25 
 '2019-07-03T16:20:48'                  25 
 '2019-07-03T16:21:48'                  25              

Data 2

Coloumn 1(Time) Coloumn 2 (Temperature)

  0                                   25 
 20                                   24.7714 
 40                                   24.5304 
 60                                   24.2764 
 80                                   24.0096 
100                                   23.7305 
120                                   23.4398 
140                                   23.1384 
160                                   22.8269 
180                                   22.5061 
200                                   22.177 
220                                   21.8401 
240                                   21.4962 
260                                   21.1459 
280                                   20.7899 

%% Loading the datas : 
load('In_Flight_Data.mat');

% Start and end dates for real-time datas obtained
DateStart = datetime('03/07/2019 17:00:00','InputFormat','dd/MM/uuuu HH:mm:ss');
DateEnd   = datetime('04/07/2019 08:00:00','InputFormat','dd/MM/uuuu HH:mm:ss');

% Datas index you want to plot
idToPlot =   [17];

% Figure initialisation
figure
hold on
leg = {};

% Loop to plot the datas one by one
for i = 1:numel(idToPlot)
    idat = idToPlot(i);
    
    % Find the measurement points that are between the start and en dates
    id = find((dataTot(idat).Date > DateStart) & (dataTot(idat).Date < DateEnd));
    
    % Plot the data
    plot(dataTot(idat).Date(id),dataTot(idat).Value(id));
    
    % Put some text in the leg array, which will be used as legend
    leg{end+1} = dataTot(idat).Name;
    
end

% Format the graph
legend(leg);     % give a ledgend
ylabel('Temperature (°C)');     % Give a label to Y axis
title('Temperatures');          % Give a title

Hello Everyone,

I would like to plot these two datas (Data 1 and Data 2) on the same plot. But one has time in datetime format and one in seconds, how do i do this? I have a code which I have posted above with which I plotted the datetime data (Data1). "idToPlot = [17];" This line simply is the index number given to a particular component for which the Datetime datas have been plotted.

Le version en Français

Bonjour à tous, Je voudrais tracer ces deux données (Data 1 et Data 2) sur le même plot. Mais on a l'heure au format datetime et l'autre en secondes, comment faire? j'ai un code que j'ai posté ci-dessus avec lequel j'ai tracé les données datetime (Data1). "idToPlot = [17];" Cette ligne est simplement le numéro d'index attribué à un composant particulier pour lequel les données Datetime ont été tracées.

[dpb]

Either add a reference start time to the elapsed times of the second set or subtract the initial time from the datetime value of the first to create a duration.

[Amal Rai]

i deleted the second code that i put to avoid confusion. With that code, i was able to plot two curves but the timescale was in seconds, but i want it in datetime scale, so i got more confused.

"Either add a reference start time to the elapsed times of the second set or subtract the initial time from the datetime value of the first to create a duration."

Can you please tell me where do i need to make the changes that you have suggested above to create a duration in my code?

Is it here:

% Plot the data

plot(dataTot(idat).Date(id),dataTot(idat).Value(id));

Answer 1

[dpb]

t1=datetime(t1,'InputFormat','uuuu-MM-dd''T''HH:mm:SS');     % convert first to datetime
t2=seconds(0:20:280).'+t1(1);                                % second based at beginning of first
plot(t1,T1,t2,T2)                                            % temperatures are T1,T2 from your variables

results in

Alternatively, keep t1 as seconds() and

t2=t1-t1(1);

to turn it also into duration from zero.

[Amal Rai]

Thank you, it worked.