Matlab expressions

I am using Dynare version 4.2.2.
In specifing the model, I have matlab expressions with matrix forms.

I’ve got the error message; syntax error, unexpected ‘’.

However, there was no problem when I used a pound sign (#) as the first
character of the line in the version 3.

How do I have to modify it?

In Dynare 4 you cannot enter matrices into the model block.