How to show a seconds plot axis ticks as hh:mm

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Mitsu 2020-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/543221-how-to-show-a-seconds-plot-axis-ticks-as-hh-mm

评论： Star Strider 2020-6-10

[Edited to clarify that X is a 2x2, part of a meshgrid.]

Assume the data for the x-axis is duration in seconds, in both directions, with values ranging from -10800 to +-10800 seconds.

I use a contourf(X,Y,Z) to plot it.

In the x-axis, instead of:

-10800, -9000, ... , 9000, 10800

I would like to show the following ticks:

-03:00, -02:30, ... , +02:30, +03:00

That is:

Change seconds duration to hh:mm
Keep negative sign in front of the negative durations
Add the plus sign to the positive values (I could do this via xtickformat('%+4.4g');, but I am not able to combine this with the hh:mm format)

I have been playing around with xtickformat and datetick, but had no success so far.

Thank you!

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采纳的回答

Star Strider 2020-6-6

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/543221-how-to-show-a-seconds-plot-axis-ticks-as-hh-mm#answer_447095

在 MATLAB Online 中打开

Try this:

X = -10800:10:+10800;
tv = seconds(X);
signal = sin(2*pi*X/1E+3);                          % Create Signal
figure
plot(tv, signal, '-')
xtickformat('hh:mm')