matlab图中的数据提示定制

我有一个包含多个图的图表，每个图都来自不同的源文件。我希望数据提示告诉我 (X,Y) 加上源文件的名称。长期以来，我最好的尝试（没有成功）是这样的：

dcm = datacursormode(gcf);
datacursormode on;
set(dcm,'UpdateFcn',[@myfunction,{SourceFileName}]);

Where 我的函数是在这种情况下使用的默认函数，粘贴在该消​​息的末尾并如下所述：http://blogs.mathworks.com/videos/2011/10/19/tutorial-how-to-make-a-custom-data-tip-in-matlab/ http://blogs.mathworks.com/videos/2011/10/19/tutorial-how-to-make-a-custom-data-tip-in-matlab/最后，SourceFileName 是一个包含源文件名称的字符串。

有谁知道更简单（或正确）的方法来做到这一点？

提前致谢。

function output_txt = myfunction(~,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');
output_txt = {['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

p=plot( x,y);
setappdata(p,'sourceFile_whatever', SourceFileName)  

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

并在回调函数中：

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).
% event_obj

dataIndex = get(event_obj,'DataIndex');
pos = get(event_obj,'Position');

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

try
    p=get(event_obj,'Target');
    output_txt{end+1} = ['SourceFileName: ',getappdata(p,'sourceFile_whatever')];
end


% 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