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Stretching a rectangle over a date axis

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Avi Michaely
Avi Michaely am 23 Sep. 2018
Kommentiert: F S am 17 Sep. 2020
Hello, I have a graph with dates as X axis (datetime variables) I'm trying to stretch a rectangle over certain dates (I have the dates stored in a vector), but the problem is that the X axis is datetime and the Y axis is doubles, so MATLAB throws an error. How can I fix this?
for I = 1:1:length(main_idleDateMat(:,1))
startX = main_idleDateMat(I,1);
endX = main_idleDateMat(I,2);
rectangle('Position', [startX idleVecStartHeights(I)-80 (endX - startX) 160]);
end

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dpb
dpb am 23 Sep. 2018
Bearbeitet: dpb am 24 Sep. 2018
Ayup, "no can do" it seems...another place TMW either hasn't yet got a round tuit or didn't think it needed to add an overloaded plotting function to take care of the new class object.
All is not lost, however, but it's a regression, indeed. :(
You'll have to revert to the venerable datenum form to plot to subsequently use rectangle or draw the lines directly with plot or line. If you do the former, then will have to also use datetick to format the x-axis as date. All in all, the direct-drawing option may turn out "more better".
ADDENDUM
Use patch. You'll have to provide X,Y vectors to outline the four corners, but it an aliased version has been created that is datetime-aware so TMW has, to their credit, done the most fundamental routine.
Mayhaps they'll eventually get to the rest...
  3 Kommentare
dpb
dpb am 24 Sep. 2018
Bearbeitet: dpb am 24 Sep. 2018
Yeah, the overloaded plot functions know what to do with the datetime or timeseries axes; it's still a work in progress for some of the other specialty routines.
Not clear whether they "just haven't got there yet" or nobody's really thought about such and have simply overlooked the other functions. Probably worth enhancement request/feature shortage/quality of implementation/bug report depending on one's point of view of how to judge the failure.
Avi Michaely
Avi Michaely am 24 Sep. 2018
Do you know if I can fill the rectangle somehow?

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Ian
Ian am 25 Apr. 2020
Bearbeitet: Ian am 25 Apr. 2020
There's a nice solution to drawing a semi-transparent colored rectangle over a plot at https://stackoverflow.com/questions/45266078/how-to-draw-a-colored-rectangle-on-a-plot-when-x-axis-is-time
Alternately, you can use area(...) ,setting 'basevalue' to define the bottom of the rectangle:
area([dates(1),dates(2)],[.4,.4],'facecolor',[.8,1,.8], ...
'facealpha',.5,'edgecolor','none', 'basevalue',-.2);
will draw a rectangle with x values between dates(1) and dates(2), and y values between -.2 (basevalue) and .4 .

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