bar() function broken for large data sets when bar color is changed?

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BG 2014-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/132086-bar-function-broken-for-large-data-sets-when-bar-color-is-changed

回答： BG 2014-6-5

Hi, I am using the bar() function to plot detailed histograms of 12-bit image data, e.g. using 4096 bins. But I am having some problems when I change the bar color. It seems that the bar plot gets corrupted when there are a large number of data points; but there is no problem if (a) the bar color is left as default and/or (b) fewer data points are used.

Here's an example that reproduces the problem (figure 2 is the corrupt one):

% Create a detailed histogram 
x = 128*round(32*rand(1,100^2)); % <- Some random data with histogram gaps
[n,b] = hist(x,128*32); % 128*32=4096
figure;
bar(b,n); % This one looks ok, using default color
figure;
bar(b,n,'r'); % Should look the same as the first one (only red), but is an unreadable mess.
% Compare to plotting only a subset of the histogram:
subrange = 1:400;
figure;
bar(b(subrange),n(subrange));
figure;
bar(b(subrange),n(subrange),'r'); % Only 400 data points, looks fine!

Am I doing something wrong or is this a bug? I am using R2014a (8.3.0.532)

Thanks, BG

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dpb 2014-6-2

Did you try resetting it to something other than 'OpenGL' on the corrupt ones to see if that had any bearing? Seems strange that it's different by default...

BG 2014-6-5

Yep, if I change the renderer to 'painters' the corrupt figures are fixed.

I just updated my graphics drivers and it made no difference to the 'OpenGL' rendered figures, so perhaps it is still a Matlab bug? I'll file a bug report and let the maintainers have a look.

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