| Command Summary | Command Syntax | Calculator Compatibility | Token Size |
|---|---|---|---|
| Inverts a point on the graph screen. | PtChg x, y | This command works on all calculators. | 2 bytes |
Menu Location
N/A
The PtChg Command
The PtChg command inverts a point on the graph screen — drawing it if it isn't already there, and erasing it otherwise. It uses point coordinates, which means that the result is determined by window variables: the x-coordinate must be between xmin and xmax, and the y-coordinate must be between ymin and ymax (with (xmin,ymin) being the bottom left and (xmax,ymax) the top right corner).
Unlike pixel commands such as 68k:PxlChg, however, PtChg won't give an error if the coordinates happen to be outside these bounds — it simply won't have any effect.
Advanced Uses
PtChg can also be used with two lists of the same size. In that case, it will invert the points for every pair of elements (xlist[n], ylist[n]). This can be used as an alternative to plots (see 68k:NewPlot) to plot a set of points.