Texas Instruments TITANIUM TI-89 - Manual (Page 813)

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),tù sin(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 , q max ,
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(3ù q),0,3.5,.1 ¸
DrawSlp CATALOG
DrawSlp x1 , y1 , slope
Displays the graph and draws a line using the
formula
y ì 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.