I am trying to plot two timeseries in one graph. Unfortunatelly, the data sets have different temporal resolutions and my code using datetime does not work. My aim is one xtick per hour. Any idea how I can solve that problem? Thanks!
dataset1 = rand(1,230).';
dataset2 = rand(1,33).';
xstart = datenum('19/02 09:00','dd/mm HH:MM');
xend = datenum('21/02 18:00','dd/mm HH:MM');
x = linspace(xstart,xend,20);
Dat = linspace(xstart,xend,numel(dataset1));
x1=[1:1:230].' %values every 15 minutes
x0_OM = datenum('19/02 09:00','dd/mm HH:MM');
x1_OM = datenum('20/02 18:00','dd/mm HH:MM');
xData = linspace(x0_OM,x1_OM,20);
Dat2 = linspace(xstart,xend,numel(dataset2));
x2=[1:4:130].' %hourly values
fig=figure ();
yyaxis left
plot(x1,dataset1);
ylabel('Dataset 1')
xlabel('timesteps (15min Interval)');
yyaxis right
plot(x2,dataset2);
ylabel('Dataset 2')
set(gca,'XTick', xData) %does not work
datetick('x', 'dd/mm HH:MM', 'keeplimits','keepticks') %does not work
I generalized your code a bit and used something nicer to inspect than random numbers. I removed the labelling part to keep the script short.
% Dataset 1, 15 minutes interval
xstart1 = datenum('19/02 09:00','dd/mm HH:MM');
xend1 = datenum('21/02 18:00','dd/mm HH:MM');
Dat1 = xstart1:1/24/4:xend1; % 1/24/4 is a 15 minutes step
dataset1 = sin(linspace(0, 2*pi, numel(Dat1)));
% Dataset 2, 1 hour interval
xstart2 = datenum('19/02 09:00', 'dd/mm HH:MM');
xend2 = datenum('20/02 18:00', 'dd/mm HH:MM');
Dat2 = xstart2:1/24:xend2; % 1/24 is a 1 hour step
dataset2 = cos(linspace(0, 2*pi, numel(Dat2)));
% Determine "global" start and end.
xstart = min(xstart1, xstart2);
xend = max(xend1, xend2);
Dat = xstart:1/24:xend;
% Plot
fig = figure();
hold on;
plot(Dat1, dataset1, '*');
plot(Dat2, dataset2, 'r*');
set(gca, 'XTick', Dat);
datetick('x', 'dd/mm HH:MM', 'keepticks', 'keeplimits');
hold off;
Principally, that should work, but the output is not nice, due to the long tick labels. Could you please check, if that is, what you wanted to achieve?