Guide to roll-your-own python hddm transforms

At one time, if you wanted to catenate two similar hddm files, you might do it with "hddmcat", or maybe with "hddmcp", or "hddmcp_c". Or if you have been in the collaboration long enough, you might remember our old friend "hddm_merge_files". Each of these utilities had a specific purpose at one time, no two of them are quite identical. There are others that do slightly different things, such as "hddm-xml", "xml-hddm", "hddm_cull_events", etc. The purpose of this page is to convince you that ALL of these are obsolete, now that the hddm python module is available. Using the python shell, you can perform a much more general set of actions on hddm input files, including merging, splitting based on event inspection, and general transforms of the event content. All of this is illustrated with examples below.