Texas Instruments PLUS TI-89 - Manual (Page 457)

440 Appendix A: Functions and Instructions
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 440 of 132
DrawPol CATALOG
DrawPol expression [, qmin ] [, qmax ] [, qstep ]
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=slope ø (x ì 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.