To enter a function or to check its arguments, tap fn and the bottom right of the screen, scroll the list, and tap the function you want. You can also tap outside the list to discard it. Previous commands can be retrieved with the arrows at the top left of the screen. The command field can be cleared completely with a tap on the C near the arrows. To stop execution, press the Page Down key until the Eval button label is displayed.
Some commands produce graphical output.
Graphics replace the text output below the command field. Graphics and text output may be toggled with the T and G buttons at the top of the screen. Graphics are usually scaled to fill the graphics area. No axis is drawn, because of the constrained screen size. To check the scale, tap anywhere in the graphics area and read the coordinates of the point below the pen.