ls in x
<A HREF = "tdiff.m        ">tdiff          </A>: produce matrix differences
<A HREF = "trimc.m        ">trimc          </A>: return a matrix (or vector) x stripped of the specified columns.
<A HREF = "trimr.m        ">trimr          </A>: return a matrix (or vector) x stripped of the specified rows.
<A HREF = "tsdate.m       ">tsdate         </A>: produce a time-series date string for an observation #
<A HREF = "tsdate_d.m     ">tsdate_d       </A>: demonstrate tsdate functions
<A HREF = "tsprint.m 