Just like displaying coordinates, I want to display row and column number

Hi, so I am gonna plot a bunch of different graphs from a 3D matrix and I want to be able to click on the line in the graph and be able to know from which row and column the line comes from. So I tried the following tactic from enable data cursor mode:

function txt = displayCoordinates(~,info)
    x = info.Position(1);
    y = info.Position(2);
    txt = ['(' num2str(x) ', ' num2str(y) ')'];
end

x=1:2;
y(:,:,1)=[1 1 2 3; 1.5 2 2.5 3.5];
y(:,:,2)=[2 3 4 6; 2.5 3 4.5 6.5];
 
figure(1)
for i=1:2
    for j=1:4
        plot(x,squeeze(y(i,j,:)))
        hold on
        dcm = datacursormode;
        dcm.Enable = 'on';
        %dcm.DisplayStyle = 'window';
        dcm.UpdateFcn = @displayCoordinates;
    end
end

So the clicking on the line works perfectly fine. The only problem is that I can't seem to implement how to display the row and column instead of the coordinates. So I tried this, but it doesn't work.

function txt = displayCoordinates(~,info)
    txt = ['row is ' num2str(i) ', column is' num2str(j)];
end

Does anyone know how I can make this work?

Answer 1

[Walter Roberson]

x=1:2;
y(:,:,1)=[1 1 2 3; 1.5 2 2.5 3.5];
y(:,:,2)=[2 3 4 6; 2.5 3 4.5 6.5];
 
figure(1)
for i=1:2
    for j=1:4
        plot(x,squeeze(y(i,j,:)), 'UserData', [i j])
        hold on
    end
end

dcm = datacursormode;
dcm.Enable = 'on';
%dcm.DisplayStyle = 'window';
dcm.UpdateFcn = @displayCoordinates;

function txt = displayCoordinates(hObject,info)
    ud = hObject.UserData;
    if numel(ud) ~= 2
      x = info.Position(1);
      y = info.Position(2);
      txt = sprintf('(x,y) = (%g, %g)', x, y);
    else
      txt = sprintf('row is %d, column is %d', ud);
    end
end

[matlabber]

this only seems to show the coordinates, which is not what I want. Thanks for your effort though! I want it to display the row and column it was plotted from.

[Walter Roberson]

x=1:2;
y(:,:,1)=[1 1 2 3; 1.5 2 2.5 3.5];
y(:,:,2)=[2 3 4 6; 2.5 3 4.5 6.5];
 
figure(1)
for i=1:2
    for j=1:4
        plot(x,squeeze(y(i,j,:)), 'UserData', [i j])
        hold on
    end
end

dcm = datacursormode;
dcm.Enable = 'on';
%dcm.DisplayStyle = 'window';
dcm.UpdateFcn = @displayCoordinates;

function txt = displayCoordinates(~,info)
    ud = info.Target.UserData;
    if numel(ud) ~= 2
      x = info.Position(1);
      y = info.Position(2);
      txt = sprintf('(x,y) = (%g, %g)', x, y);
    else
      txt = sprintf('row is %d, column is %d', ud);
    end
end

[matlabber]

Thank you so much! It works perfectly!

Answer 2

[Takumi]

"info" has two fields and one of fields that named "Target" has line data.

So I atempted to use the find function to find an index that matches the data in the "Target" and the "Position".

x=1:2;
y(:,:,1)=[1 1 2 3; 1.5 2 2.5 3.5];
y(:,:,2)=[2 3 4 6; 2.5 3 4.5 6.5];
 
figure(1)
for i=1:2
    for j=1:4
        plot(x,squeeze(y(i,j,:)))
        hold on
        dcm = datacursormode;
        dcm.Enable = 'on';
        %dcm.DisplayStyle = 'window';
        dcm.UpdateFcn = @displayCoordinates;
    end
end
function txt = displayCoordinates(~,info)
    x = info.Position(1);
    y = info.Position(2);
    i = find(info.Target.XData==x);
    j = find(info.Target.YData==y);
    txt = ['row is ' num2str(i) ', column is' num2str(j)];
end

But this method is not robust...

[matlabber]

This looks perfect, the only thing is that it doesn't seem to work properly.. It either shows me: "row is 1, column is 1" or "row is 2, column is 2", when clicking on different lines.

Would you know how to fix that?