How can I get MATLAB to plot a date on the x-axis?

2013 10 21
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更新时间：2020 1 28
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I have a dataset with column1 = date and column2 = data. The problem is that my date is in yyyymmdd format. How can I get MATLAB to plot the date correctly in the x-axis?
Thank you in advance! :)

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dpb
dpb 2013-10-21

1 个投票

First convert the text string date format to Matlab serial dates --
doc datenum
Then plot with that value as the x-axis value and format the dates as desired via
doc datetick
dn=datenum(data(:,1),'yyyymmdd');
plot(dn,data(:,2))
datetick('x','keepticks','keeplimits')
Salt to suit...

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William
William 2020-1-28
Thank you! This had been driving me nuts, but now works perfectly.
dpb
dpb 2020-1-28
This answer is now out of date...use the new(ish) datetime class instead of datenum

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更多回答（2 个）

Sandy
Sandy 2013-10-21

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Hi dpb. I tried it this way, but for some reason it's plotting all my data as one date.

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Sandy
Sandy 2013-10-21
Nevermind, I got it. I had to convert my number to strings first. Thank you! :)
dpb
dpb 2013-10-21
Oh, didn't think about the first column being integer, granted...just for the record, alternatively, you could separate out the separate fields and use the
datenum(y,m,d,h,mn,s)
form to generate the serial numbers.

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Hello, how could I plot a quarterly data with column1, written as Q1:1991 up to Q4:2016, then my column2 is my data., please I really need help, it was in the excel.

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dpb
dpb 2017-12-3
Better form would be to create a new question, but it is at least related so I'll consider it here as "close enough"... :)
Problem first is we need to know how the date data are actually stored and imported. Since the date of the original Q, TMW has introduced the datetime class/object and improved graphics routines to be datetime aware so things are different now than then...

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Sandy
Sandy
2013-10-21

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dpb
dpb
2020-1-28

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