Hi, good question. There is not, so I just added a new function that does this.
If you pull the latest code from GitHub, and do "git checkout version1" which will put you on the version1 development branch, then there is a new function called "toMPS" you can use like this:
... //code that changes psi...
auto psi_mps = toMPS(psi);
Let me know if you encounter any issues with it or have any more questions.