HP 33s User Manual
Page 355
Operation
Index
G–3
Name
Keys and Description
Page
¼
Σ+
Accumulates (y, x) into
statistics registers.
11–2
Σ–
{
Removes (y, x) from
statistics registers.
11–2
Σx
|
{;º}
Returns the sum of x–values.
11–10 1
Σx
2
|
{;º
}
Returns the sum of squares of
x–values.
11–10 1
Σxy
|
{;º¸}
Returns the sum of products of
x–and y–values.
11–10 1
Σy
|
{;¸}
Returns the sum of y–values.
11–10 1
Σy
2
|
{;¸
}
Returns the sum of squares of
y–values.
11–10 1
σx
|
{
σº}
Returns population standard
deviation of x–values:
n
x
x
i
÷
−
¦
2
)
(
11–6 1
σy
|
{
σ¸}
Returns population standard
deviation of y–values:
n
y
y
i
÷
−
¦
2
)
(
11–6 1
θ
, r
y,x
| s
Polar to rectangular coordinates.
Converts (r,
θ
) to (x, y).
4–9