Aligning axes of two plots, one categorical axis, one datetime axis

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Louise Wilson
Louise Wilson 2020-11-16
评论： Adam Danz 2020-11-18
I have the following figure.
As you can see, the x axes of the bottom two plots are perfectly aligned. These axes are datetime and so I was able to set the xlim and xticks the same on these two plots.
However, I would like the top plot to line up in some way too. At the moment, it's all over the place and the position of the xticks on the top plot changes in relation to the lower two plots, as you move to the right.
%Plot!
figure(7);
subplot(5,1,1)
boxchart(data_dB1);
hold on
boxchart(data_dB2);
boxchart(data_dB3);
ylim([80 150]);
xlabel('Date','FontSize',14);
ylabel('SPL_{rms}', 'FontSize',14);
xtickangle(45);
legend(["50-24,000 Hz","50-5000Hz","50-1500 Hz"]);
title(site,'FontSize',14);
axis tight
xticklabels(datestr(dates_concatenated1,'dd-mm-yy'));
%plot boat count data
hold on
subplot(5,1,2)
boatcounts_dn=datenum(boatcounts.DateTime);
scatter(boatcounts_dn,categorical(boatcounts.BoatCount));
startdate=datenum(2019,08,20,8,0,0);
enddate=datenum(2019,09,10,17,0,0);
xlim([startdate, enddate]) %set x axis limits
ax=gca; ax.YAxis.Limits=categorical({'0','1'}); %set y axis limits
%plot missing boat count data, if any
hold on
boatcounts_missing_dn=datenum(boatcounts_missing.DateTime);
scatter(boatcounts_missing_dn,categorical(boatcounts_missing.BoatCount),...
'MarkerEdgeColor',[0 0 0]);
legend(); legend(["Number of boats","Data deficient"]);
%add x tick labels
x_ticks=startdate:1:enddate;
xticks(x_ticks)
xtickangle(45);
x_dates=datetime(x_ticks,'ConvertFrom','datenum');
xticklabels(datestr(x_dates,'dd-mm-yy HH:MM'));
xlabel('Date','FontSize',14);
ylabel('Boat Number','FontSize',14);
%add wind
hold on
subplot(5,1,3)
axis tight
plot(gust_hourly.Date_NZST_,gust_hourly.Speed_m_s_);ylabel('Wind speed (m/s)','FontSize',14);
yyaxis right
plot(rain_hourly.Date_NZST_,rain_hourly.Amount_mm_);ylabel('Rain (mm)','FontSize',14);
startdate=datetime(2019,08,20,8,0,0);
enddate=datetime(2019,09,10,17,0,0);
xlim([startdate, enddate]) %set x axis limits
xticks(startdate:1:enddate);
xticklabels(datestr(x_dates,'dd-mm-yy HH:MM'));
xtickangle(45);
xlabel('Date','FontSize',14);
  6 个评论
显示 4更早的评论
Louise Wilson
Louise Wilson 2020-11-16
I see now that ydata (dB_values) should be a vector, but how would I do this when I have 22 values on the x-axis...

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回答（1 个）

Adam Danz
Adam Danz 2020-11-17
编辑：Adam Danz 2020-11-17
Convert the datetime strings to datetime values and use them as the grouping variable in the boxplot. Set the datetime format before creating the boxplot.
Also, this solution uses boxplot instead of boxchart because it's much more flexible.
boxplot(dB_values,datetime(dates_concatenated1,'format','dd-MM-yy'))
xtickangle(90)
  2 个评论
Louise Wilson
Louise Wilson 2020-11-18
编辑：Louise Wilson 2020-11-18
Thanks Adam! This works, but only plots one set of dB values. I'd like to plot and group all three? This also unfortunately doesn't help me with aligning the axes of the two separate plots.
Adam Danz
Adam Danz 2020-11-18
This answer addresses the problems you described in your comment above but it's not clear how you're doing the grouping.
It's a demonstration how to plot with datetime values. If you can apply this to your plots, you will be able to set the xlim for all x-axes so that your data are aligned.
I don't understand what this means: I'd like to plot and group all three (db values).

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