Data not aligned after zooming into figure using plotyy

Hi!

Using Matlab 2023b.

Plotting some data using plotyy, here is the example code:

data1 = [1 2 3 2.5 5 6 7];
data2 = [10 20 30 25 50 60 70];
Timestamp_datetime1 = datetime(2014,1:7,1)
Timestamp_datetime2 = datetime(2014,2:8,1)
figure
[hAx,hLine1,hLine2] = plotyy(Timestamp_datetime1, data1,Timestamp_datetime2, data2,'scatter','plot')
hLine2.LineStyle = '--'

Run the code and you will get this:

If I use the zoom in function and select the data around Apr 2014, I get this:

The data points are now out of alignment on the graph.

Has anybody come across this?

Answer 1

[Adam Danz]

plotyy is not recommended. Instead, use yyaxis which replaces plotyy. I've converted your code below. yyaxis does not have the problem you've found in plotyy.

data1 = [1 2 3 2.5 5 6 7];
data2 = [10 20 30 25 50 60 70];
Timestamp_datetime1 = datetime(2014,1:7,1);
Timestamp_datetime2 = datetime(2014,2:8,1);
figure
yyaxis left
hLine1 = plot(Timestamp_datetime1, data1,'o');
yyaxis right
hLine2 = plot(Timestamp_datetime2, data2,'--');

[Ivan Teng]

Hi Adam,

Thank you for the solution.

May I suggest adding a note in the documentation for plotyy to try yyaxis?

Regards

[Voss]

The note is there already:

https://www.mathworks.com/help/matlab/ref/plotyy.html

[Ivan Teng]

Sorry, I missed that

Thank you!

[Voss]

No worries, and you're welcome!