Is it possible to programmatically check whether MATLAB has been started with the "-nodisplay" option?
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MathWorks Support Team
on 21 Jan 2010
I have a program that needs to behave differently depending on whether MATLAB has a display or not. However, I cannot determine a way to programmatically check this.
The reason I need to do this is that I sometimes start MATLAB in batch mode from a shell script, for testing my programs.
Accepted Answer
MathWorks Support Team
on 18 Oct 2013
The ability to programmatically check whether MATLAB has a display is not available in MATLAB 7.6 (R2008a).
As a workaround, you can do one of the following:
1. Manually set or unset an environment variable in your shell script that launches MATLAB, so you can query it from inside MATLAB. For instance, setting the ISDISPLAY environment variable in your shell script before launching MATLAB:
setenv ISDISPLAY no
matlab -r "foo; quit"
(here shown with C Shell syntax), means that the MATLAB command
getenv('ISDISPLAY')
will return the string 'no' in any MATLAB processes that are spawned from this shell.
2. Query the "ScreenSize" property of the root object inside MATLAB:
get(0, 'ScreenSize')
When there is no display, this returns [1 1 1 1] instead of an actual screen size.
Note that this will only work in releases prior to R2014b.
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More Answers (1)
Jan
on 29 Jul 2020
See also: https://www.mathworks.com/matlabcentral/answers/407059-if-matlab-desktop-elseif-matlab-nodesktop :
usejava('desktop')
or
java.lang.System.getProperty( 'java.awt.headless' )
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