Texas Instruments TI-89 Developer's Manual page 239

Chapter 17: Graphing
GT_Regraph
GT_Regraph_if_neccy — Regraph the current graph if necessary.
StepCk
XCvtFtoP
XCvtPtoF
YCvtFtoP
YCvtPtoF
TI-89 / TI-92 Plus Developer Guide
— Force a regraph of the current graph.
— Verify that the step value of the independent
variable for polar or parametric mode is valid.
— Convert the given floating point x coordinate to a
pixel column number based on the specified
Window variables.
— 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.
— Convert the given floating point y coordinate to a
pixel row number based on the specified Window
variables.
— 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.
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Beta Version January 26, 2001