3D bar plot, does not show solid bars

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))

Answer 1

[Thorsten]

Try

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

[Yugal]

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]

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.

Answer 2

[Walter Roberson]

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.

[Yugal]

Thanks! @Walter Roberson,

I dont have negative data,

err_Cs(:,:,2) =

299.1015 299.1228 299.1228 299.1228 299.1228 299.1228 299.1228 299.1228 299.1228 299.1228

201.7229 203.9534 204.4003 204.4049 204.4049 204.4049 204.4049 204.4049 204.4049 204.4049

102.9769 104.5377 110.2964 112.4276 112.5449 112.5454 112.5454 112.5454 112.5454 112.545

bar3(err_Cs(:,:,2))
set(gca,'ZScale', 'log');

[Walter Roberson]

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

[Yugal]

@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.