Plot time sensitive data

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Tim Richter 2021-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/1593719-plot-time-sensitive-data

评论： Bjorn Gustavsson 2021-11-26

Hello,

I imported two column vectors from a .xlsx file. The first one is called "Date", and contains the date and time of a corresponding measurement, in the format: 'yyyy-mm-dd hh:mm:ss. The second vector contains the corresponding measurment on that timestamp, let's call it 'Height'.

I tried to plot these vectors with the standard 'plot(Date,Height)' function, to see the chance of height over time. Note that the time spans multiple years, and contains thousands of measurements.

But the plot returns a tangeled mess of a graph, where the data points seem to be connected randomly to each other. I am aware of the datetime datatype, and the option to convert timestamps into different formats, without sucess in using them. But how do I get a decently looking graph, with which I can see the chance in height over time?

Thanks in Advance!

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Tim Richter 2021-11-26

Sorting the tables helped, thanks!

Bjorn Gustavsson 2021-11-26

For these types of long-term series there often are seasonal (and possibly daily) variations, to enhance those you might consider using plot3 or scatter3 where you have year on the x-axis, day of year on the y-axis and your height along the z-axis (and colour-scale).

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