MATLAB: Plotting dates on x-axis

cellchardoublegraphplot

Hello! I have a 339×1 cell with dates in the format (ex. : 2015-05-01, 2015-05-04), and a 339×1 double with corresponding numbers. I'm trying to figure out how to plot the data with the dates on the x axis and numbers on the Y, but it gives me an error trying to plot data from a cell. I tried using cell2mat, but that just gives me a 339×10 char which also can't be plotted. Pretty new to Matlab, would really appreciate any help!

Best Answer

You need to convert the date strings to date numbers with the datenum function, plot them as date numbers, then use the datetick function to plot them as formatted dates and times.

Related Solutions

MATLAB: Trouble with datetick x-axis…always starts at 1/1/00

In order to use datetick on numeric values, the values need to be in MATLAB's numeric date format. That format represents time as number of days since Jan 1, of a mythical year 0. You need to convert 20120824 to that format in order to use datetick on numeric values, The easiest way would be

startDate = datenum(num2str(tday(1)),'YYYYMMDD');
endDate = datenum(num2str(tday(end)), 'YYYYMMDD');

The next problem you have is that you datetick() works on existing x values. When you used

plot(cumret)

implicit x values of 1:length(cumret) were used. You may have calculate a variable named "x" but you have not given any connection between that variable and the axis for your plot.

What you should do is calculate startDate and endDate first (with the conversion to date numbers), and then you should

x = linspace(startDate, endDate, length(cumret));

as that defines one date value for each entry in cumret. Then

plot(x, cumret);
datetick('x', 2);

MATLAB: Convert date to datetime

t = datetime(DateStrings,'InputFormat','dd/MM/yyyy');

Best Answer

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MATLAB: Trouble with datetick x-axis…always starts at 1/1/00

MATLAB: Convert date to datetime

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