3D bar plot, does not show solid bars

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Yugal
Yugal 2025-4-29
评论： Yugal 2025-4-30
i am using bar3 to do the 3D bar plots
when I use log scale for the z axis, only the top face of the 3D bar (say cuboid) shows, the rest of the bar is invisible,
figure;
bar3(err_data(:,:,2))
set(gca,'ZScale', 'log');
this does not happen on removing log scale
figure;
bar3(err_data(:,:,2))

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回答（2 个）

Thorsten
Thorsten 2025-4-29
Try
bar3(log(errdata(:,:,2)))
  2 个评论
Yugal
Yugal 2025-4-29
Thanks! @Thorsten
But still theres a problem
all the bars does not start from same level in z-axis, so not easy to compare
Yugal
Yugal 2025-4-29
I got a solution
figure;
bar3(log10(err_Cs(:,:,2))-5)
% set(gca,'ZScale', 'log');
I shifted the positve bars to negative side by subtracting all the bars z data by 5 units.

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Walter Roberson
Walter Roberson 2025-4-29
You have negative z data. When you set(gca,'ZScale', 'log') then any shape that has a vertex with negative Z cannot be rendered. Remeber that the log() of negative data is pi*1i plus log(-1*data) and renderers cannot handle the imaginary component of the resulting vertices.
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Yugal
Yugal 2025-4-30
@Walter Roberson that negative comes after taking the log of actual error (e.g. log10(0.1) = -1, like that)
The data itself doesnt have any negative values.

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