How to prevent pcolor from joining gaps in datetime?

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David Velasco
David Velasco 2021-8-13
评论： Maria-Eleni Gidarakou 2023-1-4
I am using pcolor to create a contour graph where the x-axis is a datetime vector. Data exists in 6 s increments from 09:00:00 to 09:03:54 and then from 09:30:00 to 09:33:54 only:
09:00:00
09:00:06
09:00:12
...
09:03:42
09:03:48
09:03:54
09:30:00
09:30:06
...
When using pcolor, it joins the last sample of the first time span with the first sample of the second time span. See attached image. How do I make it such that the time gap between 09:03:54 and 09:30:00 is not plotted? I would like for this region to just be blank or transparent or otherwise not visible.

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Image Analyst
Image Analyst 2021-8-13
Try setting those values to nan.
Or else use imshow() and set those values to 0 (black).
By the way, did you know that pcolor() does not display the last row and alst column of your data?
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David Velasco
David Velasco 2022-12-22
In my case, data were collected every 6 s, so I looked for the gaps in the datetime vector (Date)...
lastSamp = find(diff(Date) > duration('00:00:07'));
...then set the last sample to nan in my Data:
Data(:,lastSamp) = nan;

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