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

Question

Eric Bernard Dilger 2021-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/883494-how-can-i-set-the-format-hh-mm-to-plot-an-array

评论： Eric Bernard Dilger 2021-7-22

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.

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Answer 1

Chunru 2021-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/883494-how-can-i-set-the-format-hh-mm-to-plot-an-array#answer_751559

编辑：Chunru 2021-7-22

在 MATLAB Online 中打开

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]))

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Eric Bernard Dilger 2021-7-22

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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