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matlab 2019b - bug in data tips accuracy

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Gal Maman
Gal Maman 2019 年 11 月 17 日
Edited: Adam Danz 2019 年 11 月 18 日
I'm using 2019b and I can't get the accurate value of a point in the graph using data tips.
Attached is an example.
Is there a way to fix this?

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Adam Danz
Adam Danz 2019 年 11 月 17 日
The values reported in the datatips are accurate, judging from the png image. Precision seems to be the issue, not accuracy. Note that your x and y axis ticks are x10^4. The reason the two x-values appear to be 77020 is probably because the data tips are not showing more precise values (ie, 77020.48930).
To change that, you could create a custom update function that specifies the precision to be reported. Here is a working demo below that you can easily adapt to your plotting function.
% Create a plot
ph = plot(magic(5).*7000+rand(1), 'o');
% Specify a custom update function to your data cursor object
dcm = datacursormode(gcf);
set(dcm, 'UpdateFcn', @customDataCursorUpdateFcn, 'Enable', 'On');
% Here's the function that specifies 5 decimal places
function txt = customDataCursorUpdateFcn(~, event)
pos = event.Position;
txt = {sprintf('X: %.5f', pos(1)), sprintf('Y: %.5f', pos(2))};
end % <- may not be needed

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Gal Maman
Gal Maman 2019 年 11 月 18 日
You are right, I meant precision.
The function works great, thank you!
The x axis is the indices of the vector (integers), I didn't have this problem in Matlab 2019a.. is there a way to set it to default?
Adam Danz
Adam Danz 2019 年 11 月 18 日
Glad it worked out! I'm not sure there is a way to set the default precision of data tips. At least there wasn't in 2015 and I haven't seen any updates on that. But there's a simple fix for that. Put your custom cursor update function within its own file and every time you want the increase precision of the datatips, you just have to change the UpdateFcn for the figure (which is 1 line of code).
Gal Maman
Gal Maman 2019 年 11 月 18 日
Very helpful, thank you for your answer!

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