The update of loading matrix C

[cwwsunny6]

Dear @brandynbok and @eric-qian ,

First of all, thank you for the code, which is very well written and documented!

I have a question of updating of the matrix C in the function EMstep:

after finished the iteration of EM step ,the matrix C just change a little and the coefficient of quartly variable do not change .I want to know that's why and how to deal with this problem .

Thank you and best regards,
Weiwei Cao