How to create semi-infinite solid in MATLAB?

[Chim]

Hello,
Am working on a model that involves heat conduction in a semi-infinite solid. I have been using linspace() command for finite geometry, but now i need to create a 1-dimensional semi-infinite solid. Any suggestions?
Thank you.

 

[meldraft]

In numerical simulations, we can refer to infinity as something very far from the disturbance. In your case, if the heat conduction only takes place e.g from 0 to 1, you can set a linespace from 0 to 10 or 20, and it will effectively work as theoretical infinity would.