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From @bob-carpenter on January 3, 2015 2:22
Need utilities for Kroneckers for Gaussian processes. I don't know much about it but want to get it down as an issue and point to Ben's R example:
https://groups.google.com/forum/#!msg/stan-users/iddShgJVwTQ/QgcDEP3h9JQJ
Talk to Ben to figure out how this should look in Stan.
Copied from original issue: stan-dev/stan#1196