EXPFIT

Type:

Command

Description:

Exponential Curve Fit Command: Stores EXPFIT as the fifth parameter in the reserved variable

 

ΣPAR, indicating that subsequent executions of LR are to use the exponential curve fitting model.

 

LINFIT is the default specification in ΣPAR.

Access:

…µEXPFIT

Input/Output:

None

See also:

BESTFIT, LR, LINFIT, LOGFIT, PWRFIT

 

 

EXPLN

 

Type:

Command

Description:

Transforms the trigonometric terms in an expression to exponential and logarithmic terms.

Access:

!Ð or Convert, !Ú REWRITE or PLEXP & LN

Input:

An expression

Output:

The transformed expression.

Flags:

Exact mode must be set (flag –105 clear).

 

Numeric mode must not be set (flag –3 clear).

 

Radians mode must be set (flag –17 set).

 

Complex mode must be set (flag –103 set).

Example: Transform the following expression and simplify the result using the EXPAND command:

 

2cos ( x2)

 

 

Command:

EXPLN(2*COS(X^2))

 

 

 

EXPAND(ANS(1))

 

 

Result:

(EXP(i*X^2)^2+1)/EXP(i*X^2)

 

 

See also:

SINCOS

 

 

EXPM

Analytic Function

 

 

Type:

 

 

Description:

Exponential Minus 1 Analytic Function: Returns ex – 1.

 

 

For values of x close to zero, EXPM(x) returns a more accurate result than does EXP(x)–1.

 

(Using EXPM allows both the argument and the result to be near zero, and avoids an

 

intermediate result near 1. The calculator can express numbers within 10–449of zero, but within

 

only 10–11of 1.)

 

 

Access:

!´HYPERBOLIC LEXPM

( ´is the left-shift of the Pkey).

 

!ÐEXPM

(Ðis the left-shift of the 8key).

Flags:

Numerical Results (–3)

 

 

Input/Output:

 

 

 

 

 

 

 

 

 

 

 

Level 1/Argument 1

 

Level 1/Item 1

 

 

 

 

 

 

 

x

→

ex – 1

 

 

'symb'

→

'EXPM(symb)'

See also:

EXP, LNP1

 

 

 

 

 

 

 

 

 

 

 

EYEPT

Type: Command

Description: Eye Point Command: Specifies the coordinates of the eye point in a perspective plot.

Full Command and Function Reference 3-81