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From: Christopher on 3 May 2010 10:58
I'm trying to simply return the coordinates of two mouse clicks that snap to the vertices of some plotted data, using the datacursormode method that is outlined in the help file.

I have read some of the other how-to's and the help and demos and can't seem to figure out why this issue is recurring. I'm hoping it's something imbecilic I'm doing.

Here is my code:

altfig = figure(1);
plot(GGAData(:,1), GGAData(:,6));
datacursormode on;
startpoint = 'No';
dcm_obj = datacursormode(altfig);
set(dcm_obj,'DisplayStyle','window','SnapToDataVertex', 'On');

waitforbuttonpress;
info_struct = getCursorInfo(dcm_obj);

xi(n) = info_struct.Position(1);
yi(n) = info_struct.Position(2); % get position of first point, set as index n
plot(xi(n),yi(n),'ro') %leave a mark for selected point

index(n) = info_struct.DataIndex;

waitforbuttonpress;
info_struct = getCursorInfo(dcm_obj);

xi(k) = info_struct.Position(1);
yi(k) = info_struct.Position(2); %get position of second point, set as index k
plot(xi(k),yi(k),'ro') % leave a mark for second point

index(k) = info_struct.DataIndex;
From: Christopher on 3 May 2010 11:03
By the way, the error I'm getting is the fabled "Attempt to reference field of non-structure array" and it's occurring on the line when I try to take those info_struct.Position(1) and info_struct.Position(2) and save them as my own variables.
From: Christopher on 3 May 2010 15:34
Anyone? I'm stuck here... hoping it's right in front of my nose... But I can't get this to work. By the way some of this code worked in a previous version of MATLAB, which I find odd.

Ginput will work but it doesn't snap to the data points on a plot, so that doesn't give me what I need.

my infostruct (following even the variable names from the example) appears to always be coming back empty and then when I try to grab the Position from it I get that error...
From: Christopher on 4 May 2010 07:50
If anyone can help me with this issue I would greatly appreciate it.

I am wondering if it's something with the 2010 version of MATLAB, since the code worked in prior versions. I'm thinking about downloading an older version to test, if I can't get a response here telling me what I'm doing wrong..
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