How to place a dot on a greek letter in a datatip? (interpreter not working)

I am trying to create a in a datatip, in a bar plot. However, everything works fine except the "\dot" command which is not recognized by the interpreter. Notice that the tick labels and the plain worked just fine. See the picture below. Adding the "$...$" or the double "$$...$$" doesn't solve the problem. So why is the "\dot" command not recognized by the latex interpreter in the datatip?

Here is a piece of code which reproduces the issue:

figure
bar(rand(3,3))
set(gca,'TickLabelInterpreter','latex',...
    'XTick',[1 2 3],...
    'XTickLabel',{'$C_{L\dot{\alpha}}$','$C_{L\alpha}$','$C_{L\dot{\alpha}}$'}); % This works fine

set(datacursormode,'updatefcn',@mydatatip)


function output_txt = mydatatip(~,event_obj)
% Display data cursor position in a data tip
% obj          Currently not used (replaced by ~)
% event_obj    Handle to event object
% output_txt   Data tip text, returned as a character vector or a cell array of character vectors

pos = event_obj.Position;

%********* Define the content of the data tip here *********%
tipname = {'$C_{L\dot{\alpha}}$','C_{L\alpha}','C_{L\dot{\alpha}}'}; % Adding $$ doens't help (the first and last label)

% Display the y value:
output_txt = {[tipname{round(pos(1))},formatValue(pos(2),event_obj)]};

%***********************************************************%

    function formattedValue = formatValue(value,event_obj)
        % If you do not want TeX formatting in the data tip, uncomment the line below.
        % event_obj.Interpreter = 'none';
        if strcmpi(event_obj.Interpreter,'latex')
            valueFormat = ' \color[rgb]{0 0.5 1}\bf';
            removeValueFormat = '\color[rgb]{.15 .15 .15}\rm';
        else
            valueFormat = ': ';
            removeValueFormat = '';
        end
        formattedValue = [valueFormat num2str(value,4) removeValueFormat];
    end

end % End mydatatip

I have tried the solution posted here with no success:

how-to-properly-display-tex-strings-in-axes-datatips-matlab-hg2

and also this one from 2017, again with no success:

special-characters-in-datacursormode

Any help is appreciated!

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/370502-special-characters-in-datacursormode#answer_294582

I note that you are using R2018b. I believe that there are expanded datatip facilities in R2019a... though I do not know if they are documented.

[Adri]

I have seen that answer. I have no issues creating the greek letter. It's the dot over the greek letters with the problem. Look, the greek letter works but not the one with the \dot command:

Thank you for your time anyway!

[Walter Roberson]

I see that when you use datacursormode() that one of the permitted options is 'Interpreter', 'latex' . Is that something you have tried ?

[Adri]

Nope, but I tried it and it solved the problem. Thank you!

Answer 1

[Adri]

The answer is to set the latex interpreter in

set(datacursormode,'updatefcn',@mydatatip,'interpreter','latex')

and not in "mydatatip" function. The dollar signs $$ are needed, of course. Thank you Walter for the help!