			   CHANGING THE GRAPH PAPER

To change the background graph paper, first select Paper from the View menu.
Then you need to respond to three prompts (more if you select Log paper):

+ Select type of graph paper:
  - Rectangular is the default paper
  - Trig is labeled in multiples of pi along the x axis for trig functions
  - Polar paper consists of concentric circles marking the distance r, and
    radiating lines marking the angle theta at intervals of pi/6 radians.
  - Logarithmic paper allows you to scale one or both axes logarithmically,
    so that, for instance, 0.1, 1, and 10 are equally spaced.

If you select Log paper, you will also be asked to specify a base and choose
between semi-log (y axis only) and log-log paper (both axes logarithmic). If
you choose base 10, you will see 9 lines per decade just like real graph paper
if there is enough space to display them (generally when less than four
decades are shown). Otherwise, the graph paper will still be rectangular, but
with gridlines at integer powers of the base. Note that when you switch from
or to log paper, the graphs that are on-screen will have to be recalculated,
since the shape of the curves is distorted when you take the logarithm.

				      Press PgDn for more help on Graph Paper.
		      CHANGING THE GRAPH PAPER, continued

+ Select grid detail level:
  - No grid hides the gridlines completely
  - Dots draws reference dots everywhere the gridlines would cross
  - Gridlines draws dashed lines across the grid (Solid grid for solid lines)

+ To customize the look of the axes, respond to "Select axis decorations:"
  - No axes turns off the axes (legends may still be displayed along the
    invisible axes unless you turn them off with the Legends command)
  - Plain shows the axes without any decorations
  - Arrows draws arrows on the positive end of the axes
  - Labels shows 'x' and 'y' labels at the positive ends of the axes
  - Both draws both arrows and labels on the axes

			      CLEARING THE SCREEN

Select Clear in the View menu to clear the screen. Everything will be erased
and the grid will then be redrawn. If an error has garbled the whole screen,
here's a hint to help regenerate it: first press ESC until the top menu bar is
refreshed, and then use Clear to redraw the rest of the screen.

						 Press PgDn for help on Scale.
			      CHANGING THE SCALE

The scale function allows you to change the scale of the graph you have on-
screen while keeping the center of the display the same (the origin may move
but if (2,2) is at the middle of the screen, it will stay there). The scale is
relative to the size of the grid that is presently on the screen, so you need
not make any comparison with the default grid. To rescale the grid, select
Scale from the View menu. Then you must provide a "scale factor" to tell the
program how much to change the size of the grid.

Enter a positive number to zoom in, or a negative number to pan out. (In the
Camcorder terminology, a positive number acts as a telephoto and a negative as
a wide-angle lens.) The number of units across the screen will be divided or
multiplied by that number accordingly. Numbers between -1 and 1, inclusive,
are not allowed because they produce meaningless values. Decimals greater than
1 or less than -1 are valid though.

If you enter an invalid number, you will be asked to enter the scale again. To
abort rescaling, leave the field blank and just press enter.

The program remembers the value you type in and presents it as a default the
next time you Scale the grid. The original default is "2".
						 Press PgDn for help on Range.
			   ADJUSTING THE GRID RANGE

There are several ways besides zooming in and out to adjust the Grid Range:
+ To set the area of the grid displayed to a predetermined region, simply
  respond to the prompts for the coordinates of the left, right, bottom, and
  top of the grid by typing in any constant expression.

+ To focus the area displayed on an approximate region but keep a square grid
  (1:1 x/y aspect ratio), enter 3 of the 4 coordinates, but respond "auto" to
  the fourth one. It will be calculated automatically to make a square grid.

+ To select a region on the x axis and calculate both top and bottom y
  coordinates to produce a square grid that has equal portions above and below
  the x axis, respond "auto" to for both bottom and top coordinates.

+ (Requires a mouse) To zoom in on a region of the current range, click and
  drag to select the zoom box (the y dimension is constrained to maintain the
  same aspect ratio as the current grid). Then choose Grid Range in the menu.

+ To reset the grid range to its initial setting, choose Default Grid from the
  View menu. (Note: the current grid becomes the default when you Save Setup.)

			   Press PgDn for help on changing the range of theta.
			  CHANGING THE RANGE OF THETA

Because the independent variable (theta) in polar coordinates is fundamentally
different from the 'x' of Cartesian coordinates, the Cartesian x/y ranges are
not used to determine the domain of the equation for polar graphs.  The
default domain for theta ranges from 0 to 2pi, but you can change this to
whatever you prefer.

To change the range, select Theta range from the View menu and enter the start
and end of the range you want.  For these prompts, you can type in any
expression, even using fractions and functions, as long as it evaluates to a
constant.  In particular, although Graphmatica works exclusively with radians,
you can enter the range in degrees by typing in a number times the constant
'd', which converts degrees to radians, as in "45d" for 45 degrees.  You can
also easily specify a radian measure as a multiple of pi, as in "2p" for 2 pi.

			   CHANGING THE COLOR SCHEME

In EGA and VGA modes, you can select between three color schemes: gray, black,
and white backgrounds.  Select Colors from the View menu and choose your
favorite scheme from the dialog box to switch.

────────────────End of View help. Press ESC to return to menu.────────────────

