Xtick in timeseries Plot

Question

j_solar 2013-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/59112-xtick-in-timeseries-plot

采纳的回答： owr

I am plotting a timeseries and I can't manage to choose the Xtick on it.

I automatically get values like:

05:00 05:48 06:36 07:24 08:12 ............. in the Xaxis for a days values

I would like to change it to whole values like

05:00 06:00 07:00 08:00

ty for the help

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Answer 1

owr 2013-1-17

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This may not be the cleanest solution, but it should work well enough, or give you some ideas at least.

1) Draw your graph

Example:

x = 4.3:0.1:9.2;
y = x.^2;
plot(x,y);

2) Set the axis xtick to your specified values

xt = 5:1:8;
set(gca,'xtick',xt);

3) If you want your custom time based format, convert the xtick values to text with your specified formatting, override xtick labels

fun = @(n) sprintf('%02d:00',n);
xtl = arrayfun(foo,xt,'uniformoutput',false);
set(gca,'xticklabel',xtl);

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owr 2013-1-17

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If your time is measured in decimals, just sample 'xt' in 0.5 increments:

xt = 5:0.5:8

You'll then need a function that converts decimals to hours, minutes, etc.

"datevec" might do the trick if you're using serial dates for your time array:

[y,m,d,h,mn,s] = datevec(now)

Sounds like a fun project, good luck

j_solar 2013-1-18

uhm, I tried it but I don't think it works in my case.

I have an array of values every minute(1440 values from 00:00 to 23:59) and I want to plot it vs time and I want time to go every half an hour from 5:00 5:30 6:00 6:30... to 20:00.

xt must start in 300 otherwise it doesn't plot it in the right place. I have tried xt = 300:30:1200 but it doesn't work well. I think I need to change

fun = @(n) sprintf('%02d:00', n);

to add the minutes

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