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Operation Index G-15
()
Given a y–value in the X–register,
returns the x–estimate based on the
regression line: = (y – b) ÷ m.
12–11 1
!
* Factorial (or gamma).
Returns (x)(x – 1) ... (2)(1), or Γ (x +
1).
4–15 1
XROOT
The argument
1
root of
argument
2
.
6–16 1
w
ÕÕ ( w )Returns
weighted mean of x values: (Σy
i
x
i
) ÷
Σy
i
.
12–4 1
Displays the mean (arithmetic
average) menu.
12–4
x<> variable
x exchange.
Exchanges x with a variable.
3–8
x<>y
x exchange y.
Moves x to the Y–register and y to
the X–register.
2–4
Displays the "x?y" comparison tests
menu.
14–7
x≠y
(≠)
If x≠y, executes next program line;
if x=y, skips next program line.
14–7
x≤y?
Õ (≤)
If x≤y, executes next program line;
if x>y, skips next program line.
14–7
x<y?
ÕÕ(<)
If x<y, executes next program line;
if x≥y, skips next program line.
14–7
x>y?
ÕÕÕ (>)
If x>y, executes next program line;
if x≤y, skips next program line.
14–7
x≥y?
ÕÕÕÕ (≥)
If x≥y, executes next program line;
if x<y, skips next program line.
14–7
Name Keys and Description Page
x
ˆ
ˆ
x
ˆ
x