>> gpuDevice

ans =

  CUDADevice with properties:

                      Name: 'GeForce 840M'
                     Index: 1
         ComputeCapability: '5.0'
            SupportsDouble: 1
             DriverVersion: 10
            ToolkitVersion: 9
        MaxThreadsPerBlock: 1024
          MaxShmemPerBlock: 49152
        MaxThreadBlockSize: [1024 1024 64]
               MaxGridSize: [2.1475e+09 65535 65535]
                 SIMDWidth: 32
               TotalMemory: 2.1475e+09
           AvailableMemory: 1.6946e+09
       MultiprocessorCount: 3
              ClockRateKHz: 1124000
               ComputeMode: 'Default'
      GPUOverlapsTransfers: 1
    KernelExecutionTimeout: 1
          CanMapHostMemory: 1
           DeviceSupported: 1
            DeviceSelected: 1

>> system('nvcc --version');
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2017 NVIDIA Corporation
Built on Fri_Sep__1_21:08:32_Central_Daylight_Time_2017
Cuda compilation tools, release 9.0, V9.0.176

>> mex -setup
MEX configured to use 'MinGW64 Compiler (C)' for C language compilation.
Warning: The MATLAB C and Fortran API has changed to support MATLAB
     variables with more than 2^32-1 elements. You will be required
     to update your code to utilize the new API.
     You can find more information about this at:
     https://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.

To choose a different language, select one from the following:
 mex -setup C++
 mex -setup FORTRAN

>> mex -setup C++
MEX configured to use 'MinGW64 Compiler (C++)' for C++ language compilation.
Warning: The MATLAB C and Fortran API has changed to support MATLAB
     variables with more than 2^32-1 elements. You will be required
     to update your code to utilize the new API.
     You can find more information about this at:
     https://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.

>> mex mexGPUExample.cu
Error using mex
No supported compiler was found. For options, visit
https://www.mathworks.com/support/compilers.

>> mexcuda -v mexGPUExample.cu
Warning: The selected C++ compiler is not supported for CUDA compilation. Searching
for a supported compiler.
> In mexcuda (line 89)
Trying MEX options 'C:\Program Files\MATLAB\R2018a\toolbox\distcomp\gpu\extern\src\mex\win64\nvcc_msvcpp2015.xml'...FAILED
Trying MEX options 'C:\Program Files\MATLAB\R2018a\toolbox\distcomp\gpu\extern\src\mex\win64\nvcc_msvcpp2017.xml'...FAILED
Trying MEX options 'C:\Program Files\MATLAB\R2018a\toolbox\distcomp\gpu\extern\src\mex\win64\nvcc_msvcpp2013.xml'...FAILED
Trying MEX options 'C:\Program Files\MATLAB\R2018a\toolbox\distcomp\gpu\extern\src\mex\win64\nvcc_msvcpp2012.xml'...FAILED
Warning: No supported host compiler found, or other problem with the environment.
Continuing with selected compiler to provide detailed diagnosis.
> In mexcuda (line 130)
mex -largeArrayDims -f C:\Program Files\MATLAB\R2018a\toolbox\distcomp\gpu\extern\src\mex\win64\nvcc_msvcpp2015.xml NVCC_FLAGS="" -v mexGPUExample.cu
Verbose mode is on.
... Looking for compiler 'NVIDIA CUDA Compiler' ...
... Looking for registry setting 'HKLM\SOFTWARE\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
... Looking for registry setting 'HKLM\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
... Looking for registry setting 'HKCU\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VC7' 14.0 ...No.
Did not find installed compiler 'NVIDIA CUDA Compiler'.
Error using mex
No supported compiler was found. For options, visit
https://www.mathworks.com/support/compilers.

Error in mexcuda (line 157)
    [varargout{1:nargout}] = mex(mexArguments{:});