This command is used to draw a box in the graph.
Move the cursor to a
clear area of the graph, and press @BOX@. This highlights the cursor. Move the
cursor with the arrow keys to a point away, and in a diagonal direction, from
Press @BOX@ again.
the current cursor position.
A rectangle is drawn whose
diagonal joins the initial and ending cursor positions.
The initial position of
the box is still marked with and x. Moving the cursor to another position and
pressing @BOX@ will generate a new box containing the initial point. To deselect
BOX, move the cursor to the original point where BOX was activated, then
press @LINE @LINE.
This command produces a circle. Mark the center of the circle with a MARK
command, then move the cursor to a point that will be part of the periphery of
the circle, and press @CIRCL. To deactivate CIRCL, return the cursor to the
MARK position and press @LINE.
Try this command by moving the cursor to a clear part of the graph, press
@MARK. Move the cursor to another point, then press @CIRCL. A circle centered
at the MARK, and passing through the last point will be drawn.
Pressing @LABEL places the labels in the x- and y-axes of the current plot. This
feature has been used extensively through this chapter.
This command is used to remove parts of the graph between two MARK
positions. Move the cursor to a point in the graph, and press @MARK. Move
the cursor to a different point, press @MARK again. Then, press @@DEL@. The
section of the graph boxed between the two marks will be deleted.