Texas Instruments TI-89 Developer's Guide

Chapter 17: Graphing
197
TI
-
89 / TI
-
92 Plus Developer Guide
Not for Distribution
Beta Version January 26, 2001
GT_Regraph
— Force a regraph of the current graph.
GT_Regraph_if_neccy
— Regraph the current graph if necessary.
StepCk
— Verify that the step value of the independent
variable for polar or parametric mode is valid.
XCvtFtoP
— Convert the given floating point x coordinate to a
pixel column number based on the specified
Window variables.
XCvtPtoF
— Convert the given pixel column number to the
corresponding floating point x coordinate at the
center of that column, based on the specified
Window variables.
YCvtFtoP
— Convert the given floating point y coordinate to a
pixel row number based on the specified Window
variables.
YCvtPtoF
— Convert the given pixel row number to the
corresponding floating point y coordinate at the
center of that row, based on the specified Window
variables.

Texas Instruments TI-89 Specifications

General

Display size (HxV)	100 x 160 mm
Memory type	639K FLASH ROM, 188K bytes RAM
Compatible operating systems	Operating System 2.09
Battery type	AAA