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The Compleat User RPL Encyclopedia


(“Sigma X”)

  x

Not in HP-28

Keyboard Access:
  HP48S: LS-STAT LS-PREV
  HP48G: LS-STAT SUMS
HP49/50: 103 MENU
Sum of X Values command: Sums the values in the independent-variable column of the current statistical matrix (reserved variable ).

The independent-variable column is specified by the command and is stored as the first parameter in the reserved variable . The default independent-variable column number is 1.

Example: If the total of the values in the X column of your statistics data is -153, then  will return -153. The output can be any real number.

BYTES: 2.5