3D bar plot, does not show solid bars

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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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Answer 1

Thorsten 2025-4-29

在 MATLAB Online 中打开

1 个投票

Try

bar3(log(errdata(:,:,2)))

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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 2025-4-29

在 MATLAB Online 中打开

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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Answer 2

Walter Roberson 2025-4-29

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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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Walter Roberson 2025-4-30

https://www.mathworks.com/matlabcentral/answers/2176730-3d-bar-plot-does-not-show-solid-bars#comment_3332736 clearly shows negative "error"

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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3D bar plot, does not show solid bars

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