Indices shown in plot are off

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Davis 2024-5-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120036-indices-shown-in-plot-are-off

评论： Torsten 2024-5-22

Screenshot 2024-05-17 174400.png

For large vectors, the indices shown in a figure are a bit off. For example:

test = [zeros(1,1079998), 1, zeros(1,1457106-1079998), 1, zeros(1,2159999-1457108)];

find(test) % gives correct indices: 1079999 1457108

figure; plot(test)

% The labeling of the 1's in the plot using data tips give idices of 1080000 and 1457110

This is probably a numeric precision issue.

回答（1 个）

Torsten 2024-5-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120036-indices-shown-in-plot-are-off#answer_1459681

编辑：Torsten 2024-5-17

My guess is that the x-axis has a resolution of 10.

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Davis 2024-5-22

编辑：Davis 2024-5-22

I got the following response from Mathworks:

After initial investigation, the description matches our record and indicates this is likely a known bug. The potential reason is that the datatip is using "%g" as output format. I want to let you know that our development team is aware of this issue. We appreciate your effort in identifying and reporting issues to help us provide our users with better experience using MATLAB.

Meanwhile you could manually set the datatip output format with the following code:

test = [zeros(1,1079998), 1, zeros(1,1457106-1079998), 1, zeros(1,2159999-1457108)];

find(test) % gives correct indices: 1079999 1457108

figure;

p = plot(test)

p.DataTipTemplate.DataTipRows(1).Format ='%d'