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The Compleat User RPL Encyclopedia


(“Sigma X*Y”)

  x

Not in HP-28

Keyboard Access:
  HP48S: LS-STAT LS-PREV
  HP48G: LS-STAT SUMS
HP49/50: 103 MENU (In the HP49/50,  is an alias for )
Sum of X Times Y command: Sums the of all the (X,Y) ordered pairs in the current statistical matrix (reserved variable ).

Column 1 is the default X column, and column 2 is the default Y column; these can be changed with the and commands respectively.

Example: If the set of (X,Y) data points in are (1,2), (3,4) and (5,7), then  calculates 1*2 + 3*4 + 5*7 and returns 49.

BYTES: 2.5