datatip gives same x value for different samples

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Paul Hoffrichter 2022-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/1872397-datatip-gives-same-x-value-for-different-samples

评论： Paul Hoffrichter 2022-12-6

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')

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Answer 1

Mario Malic 2022-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/1872397-datatip-gives-same-x-value-for-different-samples#answer_1121527

编辑：Mario Malic 2022-12-6

在 MATLAB Online 中打开

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