In this section we discuss how to install and setup the MOSEK Optimization Toolbox for MATLAB.
Before running this MOSEK interface please make sure that you:
The Optimization Toolbox for MATLAB can be used with MATLAB version R2017a or newer on
Locating files in the MOSEK Optimization Suite
The relevant files of the Optimization Toolbox for MATLAB are organized as reported in Table 4.1.
Toolbox (without overloading)
<MSKHOME> is the folder in which the MOSEK Optimization Suite has been installed.
Setting up the paths
To use Optimization Toolbox for MATLAB the path to the toolbox directory must be added via the
addpath command in MATLAB. Use the command
On the Windows platform the relevant paths are
addpath <MSKHOME>\mosek\10.0\toolbox\r2017a addpath <MSKHOME>\mosek\10.0\toolbox\r2017aom
Alternatively, the path to Optimization Toolbox for MATLAB may be set from the command line or it can be added to MATLAB permanently using the configuration file
startup.m or from the FileSet Path menu item. We refer to MATLAB documentation for details.
4.1 Testing the installation¶
You can verify that Optimization Toolbox for MATLAB works by executing
in MATLAB. This should produce a message similar to this:
>> mosekdiag Matlab version : 18.104.22.1688062 (R2017a) Architecture : GLNXA64 mosekopt path : /home/user/somepath/toolbox/r2017a/mosekopt.mexa64 MOSEK version : 10.0.18 Test linear solve: Success mosekopt works OK. You can use MOSEK in MATLAB.
Debug and license path information can also be obtained with:
Missing library files such as libmosek64.10.0.dylib or similar
If you are using macOS and get an error such as
Library not loaded: libmosek64.10.0.dylib Referenced from: /Users/.../mosek/10.0/toolbox/r2017a/mosekopt.mexmaci64 Reason: image not found. Error in callmosek>doCall (line 224) [res,sol] = mosekopt('minimize info',prob,param);
then most likely you did not run the MOSEK installation script
install.py found in the
bin directory. See also the Installation guide for details.
Windows, invalid MEX-file, cannot find shared libraries
If you are using Windows and get an error such as
Invalid MEX-file <MSKHOME>\Mosek\10.0\toolbox\r2017a\mosekopt.mexw64: The specified module could not be found.
then MATLAB cannot load the MOSEK shared libraries, because the folder containing them is not in the system search path for DLLs. This can happen if MOSEK was installed manually and not using the MSI installer. The solution is to add the path
<MSKHOME>\mosek\10.0\tools\platform\<PLATFORM>\bin to the system environment variable
PATH. This can also be done per MATLAB session by using the
setenv command in MATLAB before using MOSEK, for example:
setenv('PATH', [getenv('PATH') ';C:\Users\username\mosek\10.0\tools\platform\win64x86\bin']);
See also the Installation guide for details.
MATLAB String type is not supported
From R2017a MATLAB provides a new string type (with double quotes). It is not supported by the Optimization Toolbox for MATLAB and may cause confusing error messages. For example the following will give an error:
mosekopt("minimize", prob) Return code - 1200 [MSK_RES_ERR_IN_ARGUMENT] [A function argument is incorrect.]
Always use old-fashioned character arrays (strings in single quotes).
MOSEK does not see new license file
If you updated your license file but MOSEK does not detect it then restart MATLAB. MOSEK is caching the license and it will not notice the change in the license file on disk.
Undefined Function or Variable mosekopt
If you get the MATLAB error message
Undefined function or variable 'mosekopt'
you have not added the path to the Optimization Toolbox for MATLAB correctly as described above.
For certain versions of Windows and MATLAB, the path to MEX files cannot contain spaces. Therefore, if you
have installed MOSEK in
C:\Program Files\Mosek and get a MATLAB error similar to:
Invalid MEX-file <MSKHOME>\Mosek\10.0\toolbox\r2017a\mosekopt.mexw64
try installing MOSEK in a different directory, for example
Output Arguments not assigned
If you encounter an error like
Error in ==> mosekopt at 1 function [r,res] = mosekopt(cmd,prob,param,callback) Output argument "r" (and maybe others) not assigned during call to "C:\Users\username\mosek\10.0\toolbox\r2017a\mosekopt.m>mosekopt".
then a mismatch between 32 and 64 bit versions of MOSEK and MATLAB is likely. From MATLAB type
which (for a successful installation) should point to a MEX file,
and not to a MATLAB
Security exception in MacOS 10.15+ (Catalina)
If an attempt to run MOSEK on Mac OS 10.15 (Catalina) and later produces security exceptions (
developer cannot be verified and similar) then use
xattr to remove the quarantine attribute from all MOSEK executables and binaries. This can be done in one go with
xattr -dr com.apple.quarantine mosek
mosek is the folder which contains the full MOSEK installation or MOSEK binaries. See https://themosekblog.blogspot.com/2019/12/macos-1015-catalina-mosek-installation.html for more information. If that does not help, use the system settings to allow running arbitrary unverified applications.