Why do I get an error when I try to launch ModelSim from within MATLAB 7.8(R2009b) on a Linux machine?

I am trying to launch ModelSim from within MATLAB. When I execute the following command

vsim

I get the following error

 ??? Error using ==> hdlsim at 189 

 hdlsim: Could not open command file 

 /nfs/iil/eda/data/disk0028/mathworks/matlab/R2009b/linux_2.6.16_x86-64/c 

 ompile_and_launch.tcl Use 'startupfile' to define 

 a valid command file. 

 Error in ==> vsim at 91 

 hdlsim(pvpairs{:});

Answer 1

[MathWorks Support Team]

MATLAB creates a 'compile_and_launch' file in the current directory when the command VSIM is executed at the MATLAB command prompt. If the user does not have write permissions to the current directory the creation of this file would fail.

To workaround this issue consider one of the following two approaches:

1. Change the current directory where user has write permissions.

2. Use the optional argument 'rundir' for the VSIM command to specify the directory where ModelSim needs to run. For example consider the following code

vsim('rundir',tempdir);