Datacursor in a for-loop surface plot

Question

Habbenzak 2015-10-30

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回答： Nitin Khola 2015-11-3

Dear Matlab users,

I am plotting a surface of temperatures over a time period i. For every step in i, an image is created. I want to add a datacursor to every plotted image on coordinates x=34, y=1 and Z (dependent on every step in i). What do i add to my code to get this?

    % code
    surf(U(:,:,i+1));
    zlabel('Temperature ^{\circ}C');
    xlabel('x distance mm');
    ylabel('y distance mm');
    title('Surfplot of heattransfer in zeolite beads');
    axis([0 34 0 34 0 200])
    M(i)=getframe(gcf);
    baseFileName = sprintf('Heattransfer_%d.png', i);
    saveas(gcf, baseFileName, 'png')
  end

Also, i want to show on what timestep the frame is. So, show i in the current surfplot. How can i get this?

Thanks in advance!

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Habbenzak 2015-10-30

在 MATLAB Online 中打开

Okay, so i managed to get the surfplot to show the timestep using the following code:

    % code
    %# delete the previous annotation
    delete(findall(gcf,'tag','timestep'))
    %# create new annotation
    annotation('textbox',...
    [0.72 0.68 0.18 0.16],...
    'String',{'time',i*dt 'sec',},...
    'FitBoxToText','on',...
    'tag' , 'timestep');
  end

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Answer 1

Nitin Khola 2015-11-3

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在 MATLAB Online 中打开

You can use the "text" object to place your text at a specific data point in your plot. In your case, I think the text contains just the position information. Within the loop you can update the "Position" and "String" properties of the text object as per your desire. Here is some sample code that illustrates the idea.

fig = figure;
surf(peaks)
t =   text(0,0,0,'start')
for ind = 1:10
    z = ind; 
    t.Position = [30 40 z];
     t.String =  ['x= ' num2str(30) ' ' 'y= ' num2str(40) ' ' 'z= ' num2str(z)];
     pause(0.1) % Make it visible to us.
end