HP 40G User Manual page 244

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X1, Y1...X9,Y9
Can contain any expression. Independent variable is T.
X0,Y0
Example
'SIN(4*T)'
X1(T)
Can contain any expression. Independent variable is θ.
R1...R9, R0
Example
'2*SIN(2*θ)'
U1...U9, U0
Can contain any expression. Independent variable is N.
Example
RECURSE (U,U(N-1)*N,1,2)
E1...E9, E0
Can contain any equation or expression. Independent variable
is selected by highlighting it in Numeric View.
Example
'X+Y*X-2=Y'
S1fit...S5fit
Defines the type of fit to be used by the FIT operation in
drawing the regression line.
From Symbolic Setup view, specify the fit in the field for
S1FIT, S2FIT, etc.
or
In a program, store one of the following constant names or
numbers into a variable S1fit, S2fit, etc.
1. Linear
2. LogFit
3. ExpFit
4. Power
5. QuadFit
6. Cubic
7. Logist
8. User defined
Example
Cubic
or
6
15-38
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Y1(T):'2*SIN(6*T)' STO
R1(θ)
E1
S2fit
S2fit
U1(N)
Programming