How to change interval unit of x axis

Hi everyone,

I am trying to figure out how to adjust the graph by changing the interval of my X axis.

I made a timetable and both X and Y values have 17300 arrays, X-value being the time interval in 15 minutes of half year.

The graph came out well. However, i wish to adjust the X-axis into hourly interval.

Is there code that adjusts a graph according to a defined inteval of X-axis?

Using the graph as an exmaple that i have made:

it can be seen that the X-axis value goes up to 18000 (15-Min Interval measurements of a half year).

I wish to change X-axis go upto 4380 (hourly Interval measurement of a half year).

I appreciate for your advice and help.

JC

[Meg Noah]

did you try

xlim([minX maxX]);

?

[Sehoon Chang]

Thank you Meg Noah for your comment.

I have tried both

1) set(gca,'xtick',....,'xticklabel',....)

2) xlim([minX maxX]);

However, both codes only restrict or changes the X-Axis Interval, not chaging the graph line.

Answer 1

[Meg Noah]

Here's one way

You can do shape downsampling - reshape then sum the lines. I made some data by digitizing yoour plot. It's attached. But use your data for the real plot of course!

load('Halbjahresdauerlinie_15min.mat')
npts = length(Halbjahresdauerlinie_15min.Heizstunden);
if (~mod(npts,4) == 0)
    error('unable to downsample because array length needs to be a factor of 4');
end
Leistung = sum(reshape(Halbjahresdauerlinie_15min.Leistung,4,npts/4))';
Leistung = Leistung/4;
Heizstunden = Halbjahresdauerlinie_15min.Heizstunden(1:4:end)/4';
Halbjahresdauerlinie_Daily = table(Heizstunden,Leistung);
figure();
plot(Halbjahresdauerlinie_Daily.Heizstunden,Halbjahresdauerlinie_Daily.Leistung);
xlabel('Heizstunden per day');
ylabel('Leistung in kW');
title('Halbjahresdauerlinie')

You can just down sample the time axis which are 15-min intervals, or you can do mean(reshape(Halbjahresdauerlinie_15min.Heizstunden, 4, npts/4); It depends upon how you want to annotate the time axis for each plot - from the half day or from the start of day...

Answer 2

[Eric Sofen]

If X is a duration array (X = minutes(0:15:262800)), you plot datetimes or durations directly, and changing the Format property of the duration will change how it displays.

compare

plot(X,Y)

to

X.Format = 'h';
plot(X,Y)