
Section 6: Functions continue100



4.

The square of the number in the Yregister is added to the contents of the
fourth statistical storage register (presently defined as
R14).



5.

The number in the Xregister is multiplied by the number in the Yregister,
and the product is added to the contents of the
fifth statistical storage register (presently defined as
R15).



6.

The number 1 is added to the contents of the last statistical register (now
defined as R16). After all of the above steps are
performed by the calculator, the total number in the last register is placed into
the display and the Xregister.



When you execute Σ+ , the stack and statistical
storage register contents are changed...


...from this...

...to this.

0.0000

0.0000

0.0000


0.0000

0.0000

LAST

0.0000

LAST



To use any of the summations individually at any time, you can recall the
contents of a statistical storage register into the Xregister by pressing
RCL and the register address. Or you can recall the
contents of the desired storage register into just the display by pressing
g
VIEW followed by the statistical register address.
Remember that VIEW does not disturb the stack registers.


When execution of Σ+ or
Σ– causes the contents of any of the
statistics register to exceed 9.999999999 × 10^{99}, execution
of the function is completed, the contents of all of the statistics registers
are updated, and 9.999999999 × 10^{99} is placed
in the register or registers that overflowed.


Example: Find Σx, Σx^{2}, Σy, Σy^{2},
and Σxy for the paired values of x and y listed below.




