HP 33s - 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