plot 2 different time data on the same axis in same graph

5 views (last 30 days)
I have 2 dataset to plot both wrt to time axis in the same plot but time data is different for both the data. on yaxis 1 I want DATA1(line) on yaxis 2 i want DATA2(buuble markers) how can i do so. I am attaching the data file

Accepted Answer

J. Alex Lee
J. Alex Lee on 30 Jan 2021
Edited: J. Alex Lee on 30 Jan 2021
To overcome the merged legend issue, you can create an empty plot to make the legend entry
T = readtable('TIMEDATA.txt');
fig = gcf;
ax(1) = axes(fig,'NextPlot','add');
ax(2) = axes(fig,'NextPlot','add',...
'XAxisLocation','top',...
'YAxisLocation','right',...
'Color','none');
Colors = lines(2);
for i = 1:2
xlabel(ax(i),"Time"+i)
ylabel(ax(i),"Data"+i)
ax(i).XColor = Colors(i,:);
ax(i).YColor = Colors(i,:);
end
h(1) = plot(ax(1), T.TIME1, T.DATA1, 'Displayname', 'DATA1','Color',Colors(1,:));
h(2) = plot(ax(1), nan, nan, 'Displayname', 'DATA2','Color',Colors(2,:));
% either manually set the other plot in the other axes to be the same
% h2copy = plot(ax(2),T.TIME2, T.DATA2,'Displayname','DATA2','Color',Colors(2,:));
% or do it this way if you want to keep things synced without needing to track your changes
h2copy = copyobj(h(2),ax(2));
h2copy.XData = T.TIME2;
h2copy.YData = T.DATA2;
legend(ax(1),h, 'Location', 'northwest')
% compute axes positions in a kind of naive way if you want to label the axes
pos = reshape([ax.Position],4,2)'
AxPos = [max(pos(:,1),[],1),max(pos(:,2),[],1),min(pos(:,3:4),[],1)]
set(ax,'Position',AxPos)

More Answers (2)

J. Alex Lee
J. Alex Lee on 29 Jan 2021
or potentially you are just looking for "hold on"
  1 Comment
Abhijit Sardar
Abhijit Sardar on 29 Jan 2021
no hold on does not work. i want 2 different time data to be represented on the same axis please see the attachment you will understand

Sign in to comment.


Walter Roberson
Walter Roberson on 29 Jan 2021
T = readtable('TIMEDATA.txt');
yyaxis right
plot(T.TIME2, T.DATA2, 'Displayname', 'DATA2')
yyaxis left
plot(T.TIME1, T.DATA1, 'Displayname', 'DATA1')
legend show
  1 Comment
Walter Roberson
Walter Roberson on 29 Jan 2021
You might notice that is not very useful. The reason is that you used a single x axes even though the x values are fairly different.
T = readtable('TIMEDATA.txt');
fig = gcf;
ax1 = axes(fig);
h(1) = line(ax1, T.TIME1, T.DATA1, 'Displayname', 'DATA1', 'color', 'k');
legend(h(1), 'Location', 'northwest')
ax1_pos = ax1.Position; % position of first axes
ax2 = axes('Position',ax1_pos,...
'XAxisLocation','top',...
'YAxisLocation','right',...
'Color','none');
h(2) = line(T.TIME2, T.DATA2, 'parent', ax2, 'Displayname', 'DATA2', 'color', 'b');
legend(h(2), 'Location', 'northeast')
Unfortunately in order to get the axes in the right location, it becomes a challenge to get a merged legend.

Sign in to comment.

Categories

Find more on Line Plots in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!