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Appendix A: Functions and Instructions 813
DrawParm CATALOG
DrawParm
expression1
,
expression2
[,
tmin
] [,
tmax
] [,
tstep
]
Draws the parametric equations
expression1
and
expression2
, using t as the independent variable.
Defaults for
tmin
,
tmax
, and
tstep
are the current
settings for the Window variables
tmin, tmax,
and
tstep. Specifying values does not alter the
window settings. If the current graphing mode is
not parametric, these three arguments are
required.
Note: Regraphing erases all drawn items.
In function graphing mode and
ZoomStd
window:
DrawParm tù cos(t),tùsin(t),0,10,.1
¸
DrawPol CATALOG
DrawPol
expression
[, q
min
] [, q
max
] [, q
step
]
Draws the polar graph of
expression
, using q as
the independent variable.
Defaults for q
min
, q
max
, and q
step
are the current
settings for the Window variables q
min, qmax,
and q
step. Specifying values does not alter the
window settings. If the current graphing mode is
not polar, these three arguments are required.
Note: Regraphing erases all drawn items.
In function graphing mode and
ZoomStd
window:
DrawPol 5ù cos(3ùq),0,3.5,.1 ¸
DrawSlp CATALOG
DrawSlp
x1
,
y1
,
slope
Displays the graph and draws a line using the
formula
yì y1=slopeø (xì x1).
Note: Regraphing erases all drawn items.
In function graphing mode and
ZoomStd
window:
DrawSlp 2,3,ë 2 ¸
DropDown CATALOG
DropDown
titleString
, {
item1String
,
item2String
, ...},
varName
Displays a drop-down menu with the name
titleString
and containing the items 1:
item1String
,
2:
item2String
, and so forth. DropDown must be
within a
Dialog...EndDlog block.
If
varName
already exists and has a value within
the range of items, the referenced item is
displayed as the default selection. Otherwise, the
menu’s first item is the default selection.
When you select an item from the menu, the
corresponding number of the item is stored in the
variable
varName
. (If necessary, DropDown
creates
varName
.)
See
Dialog program listing example.