Plot time series data in MATLAB

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Chayan Roychoudhury 2018-5-11

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回答： Cathal Cunningham 2018-5-11

I have to plot a time series data in MATLAB. The Y axis is a parameter taken six hourly for each day in a certain month of the year. And 44 such years have been taken into account. From 1958 to 2001. So the points on the X axis are 4*31*44=5456. How can I plot the data efficiently in MATLAB? The data file has two column vectors. I have to plot the x axis so that it shows 44 July s from 1958 to 2001 . Each July has 124 points. One for the time points (5456 points) so 5456 rows and other for the parameter measured. Thanks a lot.

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dpb 2018-5-11

Show us specifically

what the time data storage is and
explain how you want the forty-four months of data shown -- serially as above just labelled by year or as multiple lines (44 of 'em) as yearly observation on calendar axis Jul 1-->July 31 or something else entirely?

Chayan Roychoudhury 2018-5-11

The time data storage isnt explicit. The data file has two columns- the first containing the time points as a serial number from 1 to 5456 and the other column with the parameter values.

I want the x axis showing July of each of the 4 years. And each July will have 124 data points.

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Answer 1

Cathal Cunningham 2018-5-11

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You could try something like this:

yrs = [1958:1:2001];
lbls = cell(numel(yrs),1);
for i = 1:numel(yrs)
    lbls{i} = sprintf('July %d',yrs(i));
end
figure
time = 1:4*31*numel(yrs);
data = randi(50,1,length(time));
plot(time,data)
set(gca,'XTick',[1:4*31:4*31*numel(yrs)])
set(gca,'XTickLabel',lbls)
xtickangle(gca,45)