How to get values of X,Y,Z when i point courser on the graph

Here is the graph what i have

how to get the values of X,Y,Z when i point the courser on the graph?

i need a code which gives me information of all the paramets on the graph at that point

[Adam]

doc CurrentPoint

can help with this.

If your data is really that regular though I would recommend plotting it as an image, not a scatter plot. Scatter plot performance degrades significantly the more data points there are and it seems un-necessary if your data is on a regular grid anyway. If you have an image you can use the current point information to simply index into it. With a scatter plot it is more tricky to do that.

[Ruthvik sainath meka]

i was trying with the image but unable to plot it because i was getting matrix dimension error

can you please help me with how to use it

i have data like this and would like to plot it and then get the values from Graph

[Adam Danz]

I agree with Adam that these data would work well with an imaged. What function did you try and what was the error?

[Ruthvik sainath meka]

i tried using pcolor

and gave input for x,y,z values it says the z matrix dimension error

Answer 1

[Adam Danz]

Method 1: use data tips

% Create demo scatter plot
x = linspace(0,3*pi,200);
y = cos(x) + rand(1,200);
sz = 25;
c = linspace(1,10,length(x));
s = scatter(x,y,sz,c,'filled');

% Add an additional row to the data tips showing the color value
datatipRow = dataTipTextRow('C',c);
s.DataTipTemplate.DataTipRows(end+1) = datatipRow;

% Now click on any point to produce the data tip (image below)

Method 2: return value to command window (or anywhere else you'd like)

This uses ginput() which allows the user to click on any space within the axes. It then computes the nearest point and returns its (x,y) coordinate and color value.

% User must select 1 point
[x,y] = ginput(1); 

% Get (x,y) coordinates for all points
% *** This assumes the entire point was made with the one 
% call to scatter() instead of several calls to scatter(). 
h = gco(); 
hx = h.XData; 
hy = h.YData; 
hc = h.CData; 

% Find the nearest point to selection
d = sqrt((x-hx).^2 + (y-hy).^2); 
[~,minIdx] = min(d); 

% Return the (x,y) and color data
fprintf('(x,y,c) = (%.3f,%.3f,%.3f)\n',hx(minIdx),hy(minIdx),hc(minIdx)); 

[Ruthvik sainath meka]

i tried this code but it is only giving the result once

i have to run the code again to get other values (method 2)

can there be any modification such that it will give values when i click and dont have to run again and again

[Adam Danz]

"can there be any modification..."

Yes. One way to do it is by increasing the number in ginput(). For exampe, ginput(10) requires that the user select 10 points before anything happens. The [x,y] output will be vectors of 10. You'll also need to modify the fprintf() command unless you've implemented a different, more useful output.

Another way is to put method #2 in a loop. Let me know if you get stuck.