Reference Guide
3-132 Full Command and Function Reference
Example: Linearize the following expression:
x e
x
e
y
( )
4
Command:
LIN(X*(EXP(X)*EXP(Y))^4)
Result:
X*EXP(4X+4Y)
See also: TEXPAND
LINE
Type: Command Operation
Description: Draw Line Command: Draws a line in PICT between the input coordinates.
Access: !°L
PICT LINE
( °is the left-shift of the Nkey).
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
(x
1
, y
1
)
(x
2
, y
2
)
→
{ #n
1
, #m
1
}
{ #n
2
, #m
2
}
→
Example: This program:
« (0,0) (2,3) LINE { # 0d # 0d } PVIEW 7 FREEZE »
draws a line in PICT between two user-unit coordinates, displays PICT with pixel coordinate
{ #
0d # 0d }
at the upper left corner of the picture display, and freezes the display.
See also: ARC, BOX, TLINE
Σ
ΣΣ
ΣLINE
Type: Command
Description: Regression Model Formula Command: Returns an expression representing the best fit line
according to the current statistical model, using X as the independent variable name, and explicit
values of the slope and intercept taken from the reserved variable ΣPAR.
For each curve fitting model, the following table indicates the form of the expression returned by
ΣLINE, where m is the slope, x is the independent variable, and b is the intercept.
Model
Form of Expression
LINFIT mx + b
LOGFIT m ln(x) + b
EXPFIT be
mx
PWRFIT bx
m
Access: …µ Σ
LINE
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
'symb
formula
'
Example: If the current model is EXPFIT, and if the slope is 5 and the intercept 3, ΣLINE returns
'3*EXP(5*X)'
.
See also: BESTFIT, COLΣ, CORR, COV, EXPFIT, LINFIT, LOGFIT, LR, PREDX, PREDY, PWRFIT,
XCOL, YCOL
LINFIT
Type: Command
Description: Linear Curve Fit Command: Stores LINFIT as the fifth parameter in the reserved variable ΣPAR,
indicating that subsequent executions of LR are to use the linear curve fitting model.
LINFIT is the default specification in ΣPAR.
Access: …µ
LINFIT