How do I add monthly labels to my time series plot?

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Eloïse 2023-1-24

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回答： dpb 2023-1-25

I have data points between 1 and 9862, respresenting each day from 1990 to 2017. I have extracted the first 5 years of data and want to add monthly labels on the x-axis e.g. Oct1990 Nov1990 ..... Sep1995.

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dpb 2023-1-24

在 MATLAB Online 中打开

9862/365.25
ans = 27.0007

Is only 27 years, while the difference between 2017 and 1970 is 47 or a 46 year span.

Hence the times cannot be daily.

Easiest would be to define what the time data point really are and use a @doc:datetime vector for the independent variable and plot against it instead. Then you get date labels "for free", the format for which you can set as desired.

Eloïse 2023-1-25

thanks i meant 1990, i'll try that

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Answer 1

dpb 2023-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/1900050-how-do-i-add-monthly-labels-to-my-time-series-plot#answer_1156225

在 MATLAB Online 中打开

Ah! Typos are the bane of programming! :)

Then

t=datetime(1990,1,1):datetime(2016,12,31); % datetime vector

is5=isbetween(t,t(1),t(1)+years(5)); % logical to get 5 years from beginning

plot(t(is5),randn(sum(is5),1)) % use your dependent variable indexed, too, of course

There's not enough space to label monthly unless you compress the formatting string and/or rotate the labels, but you get time labels automagically with the datetime axis.