1 Cursor over different subplots with different x-axis

Hello everybody :)

I would like to know (and I hope so) if it is possible to put a cursor (or something similar) on every subplot of my figure:

- although the x-axis is not the same for each subplot

- with all the different cursors linked together

What I mean: if I move the cursor on the 1st subplot, the cursor on the 2nd and 3rd subplot will also move in the same manner. If the cursor is on the 670th value on the 1st subplot, the cursor is also on the 670th value on the other subplots (info: the length of the plotted vector of every subplot is the same).

How to do it?

Thank for your help, if you have some tips don't hesitate !

Answer 1

[Minialoe]

Nobody for help? :)

[Minialoe]

Here a first draft to solve my problem... I can display the index I (what I want) on the plot, but I also want to retrieve it !!! How to do it?

function Indexplot(varargin)
fig =figure;
plot(varargin{:})
set(gca,'ylim',[-50 1600]);

dcm=datacursormode(fig);
datacursormode on
set (dcm, 'updatefcn', @myfunction) ;

function [output_txt, info] = myfunction(obj,event_obj)
% Display the position of the data cursor
% obj          Currently not used (empty)
% event_obj    Handle to event object
% output_txt   Data cursor text string (string or cell array of strings).

pos = get(event_obj,'Position');
I = get(event_obj, 'DataIndex');
output_txt = {['X: ',num2str(pos(1),4)],...
    ['Y: ',num2str(pos(2),4)],...
    ['I: ', num2str(I)]};

% If there is a Z-coordinate in the position, display it as well
if length(pos) > 2
    output_txt{end+1} = ['Z: ',num2str(pos(3),4)];

end

[Minialoe]

Here with this function I can display several synchronized cursors on my plot.

Remark: fig = figure() hplot(1) = subplot(2,1,1) etc...

 function dcm=Indexplot(fig,hplot)
  % fonction qui permet d'afficher un curseur sur l'ensemble des subplot du
  % graphique
  % fig = figure(20) par ex
  % hplot correspond à {hplot(1), hplot(2), hplot(3)} avec hplot(1)=subplot(2,1,1), hplot(2)=subplot(2,1,2) par ex

dcm=datacursormode(fig);
set(dcm,'DisplayStyle','datatip',...
    'SnapToDataVertex','off','Enable','on', 'updatefcn', @myfunction)

disp('Click line to display a data tip, then press Return.')
% Wait while the user does this.
pause

c_info = getCursorInfo(dcm);
index=c_info.DataIndex;

for i=1:length(hplot) % pour chaque subplot, on affiche le cursor (au même endroit)
    hPlot=hplot(i);

      % create a datatip
      hDatatip(i) = dcm.createDatatip(hPlot);

      % get the axis data
      X = get(hPlot, 'XData');
      Y = get(hPlot, 'YData');
      Z = get(hPlot, 'ZData');

      % determine the datatip position
      if isvector(X) && isempty(Z)                % for 2D lines
          pos = [X(index) Y(index) 0];
      elseif isvector(X)                          % for 3D lines
          pos = [X(index) Y(index) Z(index)];
      else                                        % for 3D surfaces
          pos = [X(index(1), index(2)),...
              Y(index(1), index(2)),...
              Z(index(1), index(2))];
      end

      set(hDatatip(i), 'Position', pos)
      updateDataCursors(dcm)
  end

function output_txt = myfunction(obj,event_obj)
% Display the position of the data cursor
% obj          Currently not used (empty)
% event_obj    Handle to event object
% output_txt   Data cursor text string (string or cell array of strings).

% pos = get(event_obj,'Position');
% I = get(event_obj, 'DataIndex');
% output_txt = {['X: ',num2str(pos(1),4)],...
%     ['Y: ',num2str(pos(2),4)],...
%     ['I: ', num2str(I)]};
% 
% % If there is a Z-coordinate in the position, display it as well
% if length(pos) > 2
%     output_txt{end+1} = ['Z: ',num2str(pos(3),4)];
%     
% 
% 
% end

output_txt =[];

Here the way to use Indexplot. While the figure is open, Matlab has to execute the instructions.

    while ishandle(fig) %quitte la boucle si on ferme la figure

          if ~ishandle(fig); continue; end %check again if the window is open
          dcm=Indexplot(fig, hplot);
          if ~ishandle(fig); continue; end
          disp('Line ok, press Return to delete cursor(s)')
          if ~ishandle(fig); continue; end
          pause
          if ~ishandle(fig); continue; end
          dcm.removeAllDataCursors;
          if ~ishandle(fig); continue; end
          disp('Cursor(s) deleted, press Return to put a new cursor')
          if ~ishandle(fig); continue; end
          pause

      end

But this is problematic because i need to push a button everytime I want to change the cursors of place ... I can not slide them together....

Here is a way to synchronized 2 cursors on 2 plots.

https://stackoverflow.com/questions/43721024/is-it-possible-to-synchronize-data-cursors-across-multiple-figures-in-matlab

I am able to change little things to synchronize 2 cursors on 2 subplots (one on each).

But now: how to do it with 10 cursors on 2 different subplots ?

(2 curve on the 1st subplot, 2 cursors 6 six curve on the 2nd subplot, 6 cursors so in total 8 cursors... If I move 1 cursor, the 7 others have to follow)