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datetime adjustment in x-axis plot

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vignesh mohan
vignesh mohan am 22 Apr. 2024
Kommentiert: vignesh mohan am 23 Apr. 2024
Hello everyone,
I want to adjust my datetime x-axis in pcolor plot in matlab but I tried but it isn't working. I give my data here and code below:
x = [01-01-2021 00:00 01-01-2021 00:14 01-01-2021 00:28 01-02-2021 00:42] %like this one year data for 14 min intervel
y = [10.23 11.16 12.19 13.31 14.54 15.88 17.35 18.96 20.72 22.66 24.77 27.1 29.65 32.45 35.53 38.92 42.65 46.77 51.32]
z = [2.27E+03 3.94E+03 4.48E+03 6.26E+03 3.18E+03 3.78E+03 5.37E+03 5.60E+03 6.35E+03 8.47E+03 1.05E+04 1.05E+04
1.36E+04 1.12E+04 8.48E+03 3.96E+03 5.84E+03 4.55E+03 3.65E+03 6.17E+03 7.48E+03 6.98E+03 9.84E+03 1.11E+04
5.72E+04 6.90E+04 5.64E+04 4.71E+04 1.94E+04 6.37E+03 6.59E+03 6.89E+03 8.81E+03 9.70E+03 8.11E+03 9.59E+03
1.26E+04 1.34E+04 1.69E+04 1.99E+04 2.18E+04 2.62E+04 2.98E+04 9.09E+03 5.16E+03 8.73E+03 3.96E+03 4.95E+03
5.16E+03 4.06E+03 4.24E+03 6.17E+03 7.99E+03 8.20E+03 6.68E+03 1.07E+04 1.24E+04 1.36E+04 1.78E+04 1.89E+04]
Code:1
pcolor(datenum(x),y,z)
shading interp
a = gca;
set(a,'XTick');
datetick('x','dd-mmm HH:MM','keepticks','keeplimits'); # tried this it is showing only few date points
%(or)
datetick('x','dd-mmm HH:MM','keepticks'); # tried this it is also showing only few date points
Code:2
pcolor(datenum(date1),y,z)
a = gca;
a.XTick = datenum(x);
a.XTickLabel = datestr(datenum(x)); # in this code it is taking as a text and displaying all the points
I just want to show in my x-axis like Jan, Feb, Mar, till Dec or daily one point or 10 days once one point like Jan 10 Jan 20 Jan 30 Feb 10 etc.
I tried a lot of things, but I wasn't able to make this. I am waiting for the help from the experts.
Thank you in advance.
  1 Kommentar
Dyuman Joshi
Dyuman Joshi am 22 Apr. 2024
What is this line supposed to do?
x = [01-01-2021 00:00 01-01-2021 00:14 01-01-2021 00:28 01-02-2021 00:42] %like this one year data for 14 min intervel
Also, the dimensions of x (idk what the dimensions are), y (1x19) and z (1x36) do not match for making a pcolor plot.
What is the objective here? What are you trying to do?

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Antworten (2)

Steven Lord
Steven Lord am 22 Apr. 2024
Stop using datenum. If you have the text form of a date and time, use datetime instead of creating a serial date number array. You can plot or pcolor using datetime data as the coordinates directly.
x = 0:10;
dt = datetime('today') + days(x);
plot(dt, x.^2, 'o-')
  1 Kommentar
vignesh mohan
vignesh mohan am 23 Apr. 2024
Thank you for your reply
It is not showing properly @Steven Lord

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Manikanta Aditya
Manikanta Aditya am 22 Apr. 2024
You can adjust the x-axis of your plot by setting the XTick and XTickLabel properties of the axes. Here’s how you can do it:
pcolor(datenum(x),y,z)
shading interp
a = gca;
% Set the XTick to be every 10 days
a.XTick = datenum('01-01-2021 00:00'):10:datenum('01-02-2021 00:42');
% Format the XTickLabel to display the date
a.XTickLabel = datestr(a.XTick, 'dd-mmm');
% Ensure the limits of the x-axis remain the same
xlim([datenum('01-01-2021 00:00') datenum('01-02-2021 00:42')]);
This code will set the x-axis ticks to be every 10 days, and the labels will be formatted to display the date in ‘dd-mmm’ format. The xlim function is used to ensure that the limits of the x-axis remain the same.
Hope this helps.
  4 Kommentare
Aquatris
Aquatris am 22 Apr. 2024
So your x axis actually has 1 single element? I think you are not constructing your xlabel vector properly.
xVec = datenum('01-01-2021 00:00'):10:datenum('01-02-2021 00:42')
xVec = 738157
vignesh mohan
vignesh mohan am 22 Apr. 2024
same like my all the x-axis are not showing in the graphs
I had attached my sample data set. kinldy check my file @Aquatris,@Dyuman Joshi,@Manikanta Aditya
code
x = [sample{2:end,1}];
y = table2array(sample(1,2:end));
z = table2array(sample(2:end,2:end));
pcolor(datenum(x),y,z)
shading interp
a = gca;

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