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The Compleat User RPL Encyclopedia


(“Sigma Minus”)

  x    
     [vector]
Keyboard Access:
  HP-28: STAT
  HP48S: LS-STAT
         RS-STAT LS-PREV
  HP48G: LS-STAT DATA
         LS-PLOT NXT STAT DATA
HP49/50: 97 MENU (a statistics submenu)
         91 MENU (a plotting submenu)
Sigma Minus comand: Removes the bottom (most recent) row of the current statistics matrix (reserved variable ), and places it on the stack as a vector (or as a single number if is a one-column matrix). If  empties , it purges it.

 and  can be used to treat as a LIFO stack (a last in, first out buffer), which makes them generalized tools that are useful in applications other than statistics. Clever use of this technique can render new meanings to the statistics functions. For example, if you store multiple 3D vectors into , you can use the statistics functions to perform vector math on the entire vector space.

is not effected by .

See also:  

BYTES: 2.5