Can you exclude dates in date range using xlim?

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Louise Wilson
Louise Wilson on 21 Oct 2021
Commented: Chunru on 22 Oct 2021
I have a dataset where the x axis is time and the y axis is sound pressure level in dB. The data is recorded continuously on a 24hr cycle, but I'm not interested in the data collected at night. Is there a way to exclude this data using xticks or xlim?
At the moment I have:
xlim([start_dt, end_dt]); %filter to date range of interest
Would the best way to address this be to replace sd with multiple datetime ranges somehow to exclude the evening data? I'm not sure how to code this?
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Accepted Answer

Chunru
Chunru on 21 Oct 2021
Edited: Chunru on 21 Oct 2021
dn = now + [0:.5:48]/24;
y = randn(size(dn));
subplot(311)
plot(dn, y)
datetick('x')
subplot(312)
idx = hour(dn)>7 & hour(dn)<20; % day
dn1=dn(idx);
y1=y(idx);
plot(dn1, y1)
datetick('x')
subplot(313)
idx = hour(dn)>7 & hour(dn)<20; % day
dn1=dn(idx);
y1=y(idx);
plot(1:length(y1), y1)
hold on
i1 = find(diff(dn1)>0.6/24);
xline(i1+1);
h=gca;
h.XTick=1:5:length(y1);
h.XTickLabel = datestr(dn1(1:5:end), 'HH:MM:SS');
h.XTickLabelRotation = 30;
  3 Comments
Chunru
Chunru on 22 Oct 2021
What is your matlab ver? A work around is:
hold on
i1 = [4.1 5.3];
for i=1:length(i1)
xline(i1(i)+1);
end

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