Problem with Datacursor in candlechart

Hello! I have this problem using the candle chart. Plotting the Stock prices using

if true
  %candle(HI, LO, CL, OP)
end

the datacursor works fine, it shows me X and Y value ( I would rather to have also th e daate, but it is a second step)

Then I need to plot other lines, for which I update the datacursor to show dates as well using the following function:

if true
  % function dcmH = customDataCursor(h, datalabels)

% Example:
%   % generate some data and chart it
%   N = 20;
%   x = rand(N,1);
%   y = rand(N,1);
%   h = plot(x,y,'ko');
%   % make up some labels and apply them to the chart
%   labels = cell(N,1);
%   for ii = 1:N
%       labels{ii} = ii;
%   end
%   customDataCursor(h,labels)

 % Check input arguments
if ~exist('h','var')||~exist('datalabels','var')
    error('Improper inputs to function customDataCursor')
elseif ~ishandle(h)
    error('Nonexistent handle passed to function customDataCursor')
elseif length(datalabels) ~= length(get(h,'xdata'))
    error(['Error in input to function customDataCursor: '...
        'number of labels is different than the number of data points in the line'])
end

 % Put the labels in the 'userdata' property of the line
set(h,'userdata',datalabels)
 % find the handle for the data cursor; set the update function 
dcmH = datacursormode(gcf); 
set(dcmH,'UpdateFcn',@cursorUpdateFcn)

 function output_txt = cursorUpdateFcn(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).

 % position of the data point to label
pos = get(event_obj,'Position');
% read in the labels from 'UserData' of the line
labels = get(get(event_obj,'Target'),'UserData');
% read the x and y data
xvals = get(get(event_obj,'Target'),'XData');
yvals = get(get(event_obj,'Target'),'YData');
% now figure out which data point was selected
datapoint = find( (xvals==pos(1))&(yvals==pos(2)) );

 % create the text to be displayed
output_txt = { labels{datapoint};...
    ['X: ',num2str(pos(1),4)];...
    ['Y: ',num2str(pos(2),4)] };

 % 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
end

 end

end

Now if I put the cursor on the new line it is fantastic and shows me the dates, but if I position it on the candlechart it gives me an error like this:

"Error in custom datatip string function"

Someone can help me on this?

thanks

Gaia

Answer 1

[Walter Roberson]

If no point is found that matches those criteria, then "datapoint" will come out empty. Meanwhile, as there is probably no UserData there, labels will have been assigned the empty array [] and not the empty cell array {} . Then labels{datapoint} is an error.

[gaia buratti]

Thanks Walter, you're right, indeed after some trial I managed to change the function candle() such that this insert insert the datacursor for the candle chart