# How to label the points on x axis in hours.

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Vikash Raj le 31 Jan 2022
Commenté : Vikash Raj le 13 Fév 2022
Hi
I have a satellite timetsamp data in the form of '2016-02-05T01:01:24Z' I have used the matlab codes to remove T, Z and time in hours. I want to plot several days data according to time in hours with interval of 2 hrs. When I'm using the simple plot application, the axis is showing the time in days. Im intresetd to get the x axis in hours since the data also have Time in hours. How can I do this. My codes are
% Remove T and Z and time in HH:mm:ss from timestamp
TM1 = strrep(Timestamp, 'T', ' ');
TM2 = strrep(TM1, 'Z', ' ');
TmF = datetime(TM2, 'InputFormat','yyyy-MM-dd HH:mm:ss', 'Format','HH:mm:ss');
% Plot graph
plot(TmF,VTEC)
Im also attaching the simple plot which shows x axis in days.
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### Réponses (3)

Star Strider le 31 Jan 2022
Use this approach to convert the strings to datetime arrays:
old = {'2020-08-03T20:40:00.111Z'; '2020-08-03T21:40:01.123Z'};
time = datetime(old, 'InputFormat','yyyy-MM-dd''T''HH:mm:ss.SSS''Z''', 'TimeZone','UTC', 'Format','yyyy-MMM-dd HH:mm:ss.SSS')
time = 2×1 datetime array
2020-Aug-03 20:40:00.111 2020-Aug-03 21:40:01.123
time_in_hours = hour(time)
time_in_hours = 2×1
20 21
Then, plot the data against ‘time_in_hours’.
.
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Vikash Raj le 1 Fév 2022
The time that I obtained using the above codes rounds the time to whole values example 20:40:00.111 to 20.I need the time as it is. How can I do that.
Star Strider le 1 Fév 2022
O.K. I misunderstood.

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Cris LaPierre le 31 Jan 2022
First, you don't have to remove the T and Z. Just use the proper InputFormat for your timestamp
t='2016-02-05T01:01:24Z';
T = datetime(t,'InputFormat','yyyy-MM-dd''T''HH:mm:ss''Z')
T = datetime
05-Feb-2016 01:01:24
Once you have your times, just plot the data with datetimes on X. Then use xtickformat to set the display format to hours.
plot(T,5,'x')
xtickformat('HH')
If you don't want the date at all, consider using the timeofday function.
figure
plot(timeofday(T),5,'x')
xtickformat('h')
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Vikash Raj le 10 Fév 2022
Modifié(e) : Vikash Raj le 10 Fév 2022
Hi Thank you for the codes. This codes are not working in R2021 matlab program. When I run this codes it is giving error.
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Cris LaPierre le 11 Fév 2022
Vikash Raj le 13 Fév 2022
Hi
Please find the sample data attached.

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