Reference Guide

Full Command and Function Reference 3-81
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: …µ EXPFIT
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 PL EXP & 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:
2 x
2
( )cos
Command: EXPLN(2*COS(X^2))
EXPAND(ANS(1))
Result: ( EXP(i*X^2)^2+1)/EXP(i*X^2)
See also: SINCOS
EXPM
Type: Analytic Function
Description: Exponential Minus 1 Analytic Function: Returns e
x
– 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
–449
of zero, but within
only 10
–11
of 1.)
Access: !´ HYPERBOLIC L EXPM ( ´ is the left-shift of the Pkey).
!Ð EXPM (Ð is the left-shift of the 8key).
Flags: Numerical Results (–3)
Input/Output:
Level 1/Argument 1 Level 1/Item 1
x
→
e
x
– 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.