How to plot with YYYYMM date format on x-axis?

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Frits
Frits 2011-3-23
回答： Tiago Dias 2017-12-11
LS,
I would like to plot some data with dates on the horizontal axis. The dates are in YYYYMM format.
When I plot the data set, there is a small horizontal space between e.g. 200911 and 200912. However, there is a large horizontal space between e.g. 200912 and 201001. It is clear why this happens...
Does someone probably have a solution for this issue? Should i convert the YYYYMM format to a date format which matlab understands? How? Or does an option for equidistantial horizontal spacing in graphs exists?
Your help would be very much appreciated.
Best regards,
Frits

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采纳的回答

Jiro Doke
Jiro Doke 2011-3-23
This would convert your dates in YYYYMM format to serial dates which would have the correct intervals between the dates.
x = [200911 200912 201001 201002];
serialDates = datenum(num2str(x(:)), 'yyyymm')
Confirm with this:
datestr(serialDates)
  1 个评论
the cyclist
the cyclist 2011-3-23
If you use this approach, then you can use the "datetick" command (which effectively converts datenum-type numeric dates to calendar dates) to create the labels.

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更多回答（2 个）

the cyclist
the cyclist 2011-3-23
Yes, you'll need to convert those integers, which are not regular, into something that just count the months. Something like
year = floor(yyyymm/100);
month = yyyymm - 100*year;
Then count the months from some reference year/month.
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the cyclist
the cyclist 2011-3-23
You could do something like this:
yyyymmVector
set(gca,'XTick',yyyymmVector)
set(gca,'XTickLabel',num2str(yyyymmVector))
But see also Jiro's solution.
the cyclist
the cyclist 2011-3-23
In the above comment, "yyyymmVector" was meant to represent your vector of integer dates.

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Tiago Dias
Tiago Dias 2017-12-11
Hello, i have a question, i got a table, the 1st column i have my time series, DD-MM-YYYY HH:MM:SS and on the others I got my variables.
I want to plot the time vs the variables
time = data(:,1); variables = data(:,2:end);
when i make plot(time,variables) i get an error
how can i fix it besides changing the data to 1 to 300

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