Send the matlab based model to HFSS or CST

hi,guys.Im confused recently with this topic.Someone had some simple words about this as follows.But im still in obtacle.
t=linspace(-5,5,40); %matlab based model
[x,y]=meshgird(t,t);
z=peaks(x,y);
surf(x,y,z)
hfss_surf_exe();%the interface function
%then the model is built in HFSS.
I havent got the detail of function 'hfss_surf_exe()'.Who can help help help me?

Hi players
I think hfss_surf_exe() is a user defined function that if you want use it you should add it to matlab current directory or its toolbox
I hope it'll be helpful