Warning: Initializing MATLAB Graphics failed.

Question

Steradiant 2020-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/611786-warning-initializing-matlab-graphics-failed

回答： Jim Svensson 2021-2-25

Hello,

I installed MATLAB 2020b on Ubuntu 20.04 LTS. Everytime when I start matlab I get the following warning:

    Warning: Initializing MATLAB Graphics failed.
    This indicates a potentially serious problem in your MATLAB setup, which should be resolved as soon as possible.  Error detected was:
    MATLAB:badsubscript
    Index exceeds the number of array elements (0). 
    > In hgrc (line 165)
    In matlab.graphics.internal.initialize (line 15) 

Does anyone have an idea how to fix that?

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Hannes Gorges 2020-11-13

编辑：Hannes Gorges 2020-11-13

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After encountering the same issue, I contacted the support and they provided me with the following solution which solved the issue for me. The support suggested to point out that this is a known bug.

It appears that graphics initialization code (C++) evaluates the "matlab.graphics.internal.initialize.m" and initialize.m calls builtin('groot') in line 15 which triggers a series of C++ initialization code in "HGAPP.cpp" which in turn calls "hgrc.m". Based on this assumption, can you click on "hgrc" inside the warning message and compare the following code snippet with the lines 17-21 in "hgrc.m":

screenPos = get(groot, 'MonitorPositions');
% Get the screen positioned at [1 1]
screen = screenPos(and(screenPos(:,1)==1,screenPos(:,2)==1),:);
width = screen(3);
height = screen(4);

If the lines in your "hgrc.m" corresponds to the above code snippet, could you replace these lines by the following code snippet and save the M-File:

screen = get(groot, 'ScreenSize');
width = screen(3) - screen(1);
height = screen(4) - screen(2);

After that, close MATLAB, start it again and check, if the error message still exists.

Martin Laurenzis 2020-11-23

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Hi,

I solved my problem by editing hgrc.m lines:

screenPos = get(groot, 'MonitorPositions');
% Get the screen positioned at [1 1]
screenPos(:,1)=1;
screenPos(:,2)=1;
screen = screenPos(and(screenPos(:,1)==1,screenPos(:,2)==1),:);
width = screen(3);
height = screen(4);

The sceenPos line returns:

>> screenPos = get(groot, 'MonitorPositions')
screenPos =
        2561           1        2560        1440
           1         -31        2560        1440

Then:

screen = screenPos(and(screenPos(:,1)==1,screenPos(:,2)==1),:)
screen =
  0×4 empty double matrix

By setting

screenPos(:,1)=1;
screenPos(:,2)=1;

"screen" turns to:

screen = screenPos(and(screenPos(:,1)==1,screenPos(:,2)==1),:)
screen =
           1           1        2560        1440
           1           1        2560        1440

I also fixed my OpenGL problems by updating driver for NVIDIA GTX1080TI.

Thanks, Martin

tkazik 2021-1-19

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Unfortunately, this is still not solved with the third update of 2020b. The suggestions by @Hannes Gorges with the corrections by @Bruno Luong seem to work and this issue seems to be related to a setup with multiple monitors (apparently some negative indices by the display layout are creating trouble). So I guess the current suggestion does the job, but is still not 100% correct, given that:

% this returns only the 'layout' of the first monitor (size: 1x4)
screen = get(groot, 'ScreenSize'); 
% returns the full 'layout' of dual monitor (size: 2x4)
screenPos = get(groot, 'MonitorPositions');

So the proper fix will likely have to use the second cmd.

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