How can I plot two different datetime vectors in the same graph?

Question

Ron Nativ 2018-11-9

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评论： Ron Nativ 2018-11-9

Hi All,

I have two datetime vectors (time1 and time2) with different sample period and different lengths.

Each of these vectors corresponds to different variable. For example - the first vector (time1) corresponds to to water velocity (V) in a river, and the second (time2) to rain intensity (R).

Since they cover the same time range (April to November, 2018) I would like to plot them on the same graph. However, I don't seem to manage doing so, probably because they differ in length and sample frequency.

Could anyone share any solution to that?

Thanks, Ron

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Walter Roberson 2018-11-9

Which MATLAB version are you using?

Ron Nativ 2018-11-9

Thank you all for answering, Caglar, you are right, the problem was not related to the specific graphic coding, but to my data handling. Sorry for that and thanks again!

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Answer 1

Caglar 2018-11-9

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https://ww2.mathworks.cn/matlabcentral/answers/428881-how-can-i-plot-two-different-datetime-vectors-in-the-same-graph#answer_346012

编辑：Caglar 2018-11-9

在 MATLAB Online 中打开

Comment if any part is not clear.

first_date_array=datetime('today'):days(1):datetime('today')+days(10); %array for 10 days
first_data=1:1:11;
second_date_array=datetime('today'):days(2):datetime('today')+days(15); %array for 15 days and it has data for each 2nd day only
second_data=8:-1:1;
figure(1); %method 1: plot them together
plot(first_date_array,first_data,'o',second_date_array,second_data,'o'); %x,y,markershape,x,y,markershape
xlabel('Datetime'); ylabel('Data')
legend('First','Second')
figure(2); %method 2: add new plots using hold on
plot(first_date_array,first_data,'o');
hold on
plot(second_date_array,second_data,'o');
xlabel('Datetime'); ylabel('Data')
legend('First','Second')

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Answer 2

madhan ravi 2018-11-9

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编辑：madhan ravi 2018-11-9

在 MATLAB Online 中打开

Or try

yyaxis right 
plot(time1, V)
yyaxis left
plot(time2, R)

See https://www.mathworks.com/matlabcentral/answers/5456-get-plotyy-second-axis-handle#answer_7638 for grabbing handles of each axis

Also notice the X axis which is not in a datetime format (although the vectors are!)

xtickformat('dd-MMM-yyyy')

An example:

t = datetime(2014,6,28) + calweeks(0:9);
y = rand(1,10);
yyaxis left
plot(t,y);
y = 1:10;
yyaxis right
plot(t,y(1:numel(t)));
AX=findall(0,'type','axes');
AX(2)                          %grabs second axis handle experiment and see by scrolling the graph
xtickformat(AX,'dd-MMM-yyyy')