Function Key Index 207
R Linear estimate
(X-register), correlation
coefficient (Y-register).
Fits a line to a set of (x,y)
data pairs entered using
_, then extrapolates
this line to estimate a
y-value for a given
x-value. Also computes
strength of linear
relationship (r) among
that set of (x, y) data
pairs (page 79).
Q Linear estimate
(X-register), correlation
coefficient (Y-register).
Fits a line to a set of (x,
y) data pairs entered
using _, then extra-
polates this line to esti-
mate an x-value for a
given y-value. Also com-
putes strength of linear
relationship (r) among
that set of (x,y) data
pairs (page 79).
Modes
] sets calculator to
RPN mode (page 19).
[ sets calculator to
algebraic (ALG) mode
(page 19).
Mathematics
r Computes square root
of number in displayed
X-register (page 82).
q Raises number in
Y-register to power of num-
ber in X-register (page 82).
y Computes reciprocal of
number in displayed X-reg-
ister (page 82).
e Computes factorial
[n·(n–1)... 3·2·1] of number
in displayed X-register
(page 82).
> Natural antilogarithm.
Raises e (approximately
2.718281828) to power of
number in displayed X-reg-
ister (page 82).
° Computes natural log-
arithm (base e) of number
in displayed X-register
(page 82).
’ Computes square of
the number displayed in
the X-register (page 82).
Number Alteration
B Rounds mantissa of
10-digit number in X-regis-
ter to match the display
(page 82).
Ñ Leaves only the inte-
ger portion of number in
displayed X-register by
truncating fractional portion
(page 83).
T Leaves only the frac-
tional portion of number in
displayed X-register by
truncating integer portion
(page 83).
Stack Rearrangement
~ Exchanges contents
of X- and Y-registers of
stack (pages 74 and 168).
d RolIs down contents of
stack for viewing in dis-
played X-register (page
168).
F Recalls number dis-
played before the previous
operation back into the dis-
played X-register (pages
74 and 172).
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