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datatip gives same x value for different samples

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Here is a simplified example of my problem. How can I get tooltips to show X 500000, X 500001, X 500002, etc.? Instead it shows X 500000 for all of these points. When the number of points is large enough, tooltips does not give correct integer sample number.
x = 1:1e6; % sample number
y = (-1).^x;
plot( y,'.' ); ylim( [-1.5 1.5]); xlim([500000 500020]);
title('R2020a: Tooltip shows X 500000 for all the points')

Accepted Answer

Mario Malic
Mario Malic on 6 Dec 2022
Edited: Mario Malic on 6 Dec 2022
Hey Paul,
I am using the R2021b and I see the datatips properly, but you can play with the last two lines to get your desired output.
x = 1:1e6; % sample number
y = (-1).^x;
lineHandle = plot( y,'.' ); ylim( [-1.5 1.5]); xlim([500000 500020]);
title('R2020a: Tooltip shows X 500000 for all the points')
dt = datatip(lineHandle, 500010, 1);
% You can play with format specification to get the desired output
lineHandle.DataTipTemplate.DataTipRows(1).Format = '%6d';
lineHandle.DataTipTemplate.DataTipRows(2).Format = '%6d';
% lineHandle.DataTipTemplate.DataTipRows.Format is a comma separated list,
% I never remember how to assign to it
  4 Comments
Paul Hoffrichter
Paul Hoffrichter on 6 Dec 2022
Works. Thanks for digging that out of R2020a docs.

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