How to change the number of digits in a clabelm?

Hello,

I need to change the number of digits in a clabelm.

Specifically, from 800000000000 to 8.00e+11.

Thanks

Answer 1

[Anmol Dhiman]

Hello Christopher,

Unfortunately, ”clabelm” cannot be used directly to achieve this functionality.

Unfortunately MATLAB updates the text everytime the plot is redrawn - so you need to add a listener to update them each time that happens - hence why you listen for this particular event.

A possible workaround is to use the undocumented “MarkedClean” event to get the intended behavior as shown in below example.

function ScientificNotation 
    close all
    figure;
    [X,Y,Z] = peaks;
    Z = Z*10000000000;
    [C,h] = contourm(X, Y, Z,5,'ShowText','on');
    % add a listener and call your new format function
    addlistener(h,'MarkedClean',@(a,b)ReFormatText(a))
end 
function ReFormatText(h)
  textObj = findobj(h.Children,'Type','Text');
 
  for i=1:size(textObj,1)
  % get all the text items from the contour
    t = textObj(i).String;
  %for ii=1:length(t)
    % get the current value (Matlab changes this back when it redraws the plot)
    v = str2double(t);
    % Update with the format you want - scientific for example
    textObj(i).String = sprintf('%0.5e',v); % here it is specified as 0.2e 
  end
end

More information on how to specify the format can be found on the link below:

https://www.mathworks.com/help/matlab/ref/sprintf.html?searchHighlight=sprintf&s_tid=doc_srchtitle#input_argument_d119e979709

Please note that as MarkedClean is undocumented, the behavior of it might change in a future release of MATLAB.

Hope it Helps