EF = "cal_d.m        ">cal_d          </A>: An example of using cal()                               
<A HREF = "ccorr1.m       ">ccorr1         </A>: converts matrix to correlation form with unit normal scaling.
<A HREF = "ccorr2.m       ">ccorr2         </A>: converts matrix to correlation form with unit length scaling.
<A HREF = "cols.m         ">cols           </A>: return columns in a matrix x
<A HREF = "crlag.m        ">crlag          </A>: circular lag function
<A HREF = "cumprodc.m     ">cumprodc    