Texas Instruments TI89TITANIUM User Manual - Page 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[, qmin] [, qmax] [, qstep] Draws the polar graph of expression, using q as the independent variable. In function graphing mode and ZoomStd window: DrawPol 5ù cos(3ù q),0,3.5,.1 ¸ Defaults for qmin, qmax, and qstep are the current settings for the Window variables qmin, qmax, and qstep. 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. 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 See Dialog program listing example. 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.) Appendix A: Functions and Instructions 813