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How can I set the format HH:MM to plot an array?

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I'm generating some arrays to represent the irradiance fluctuations along the day. The fluctuations about 3pm are smaller than the fluctuations during the midday and I want to show the difference. So I'm able to generate the irradiance data, but I'm having some trouble to set the time format on the x axis. I'm using this script to plot the figure below:
figure
plot(point) % Irradiance fluctuation (blue plot)
hold
plot(G_dir,'--','LineWidth',2,'Color','y')
plot(G_dif,'LineWidth',2,'Color','g')
plot(G_dir + G_dif,'LineWidth',2,'Color','r')
The algorithm generates 3500 samples for each signal (one sample per second). The signals are generate by a for loop (for t = 1 : 3500). I want the x axis to be represent in HH:MM format and I also the start time to be 15:00 and the end time to be 15:58. I appreciate any help.

Accepted Answer

Chunru
Chunru on 22 Jul 2021
Edited: Chunru on 22 Jul 2021
t = datetime(0,0,0,15,0,1:3500); % Y,M,D,HH,MM,SS
x = randn(3500, 1);
plot(t, x)
datetick('x', 'HH:MM')
xlim(t([1 end]))
  1 Comment
Eric Bernard Dilger
Eric Bernard Dilger on 22 Jul 2021
Thank you @Chunru. It works very well for my application! I was trying something similar to the solution reported by you, but I wasn't understanding how to define the inicial time and the duration for the datetime function. Thank you very much!

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