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- THE DEFAULT SETTINGS
-
- When you run Graphmatica without any GRAPHMAT.INI file, the following settings
- are in effect:
- Start of range: (-8.0, *) End of range: (8.0, *)
- Fineness: 1.0 ** DrawMode: Lines
- Legends: ON Warnings: OFF
- Printer: OFF AutoRedraw: ON
- Theta range: 0 to 6.28 (2π) AutoNum: 25
- This provides a basic rectangular grid of decent size with the origin
- centered, a square aspect ratio (a 1x1 square on the grid really LOOKS
- square), and a good resolution graph.
- * varies depending on video mode; always equal and opposite and scaled
- to provide a square aspect ratio.
- ** on CGA systems fineness is automatically set down to 0.75 to speed up
- graphing.
- ──────────────────────────────────────────────────────────────────────────────
- VIEWING THE SETTINGS
-
- The current settings are almost always displayed whenever you change one
- of them. Every item under Options (unless aborted) will bring up the settings
- screen. You can also look at them manually by selecting Settings in the
- Options menu. Press PgDn for help on Fineness.
- ADJUSTING THE FINENESS
- The fineness factor determines the resolution of the graph, and in effect, the
- amount of time it takes to draw it. The fineness factor of 1 is quite adequate
- in most circumstances. Graphmatica's SmartFineness feature dynamically adjusts
- the actual step rate, making the manual fineness adjustment almost obsolete.
- SmartFineness automatically decreases the fineness when the point being
- graphed is not on the screen to speed up blank areas, then recovers automat-
- ically and backtracks to the spot where the graph comes on-screen again. It
- also varies the fineness with the slope of the equation being graphed--less
- when the slope is near-horizontal, greater when the slope tends toward
- vertical, so steep graphs are tracked more effectively. As the fineness is
- increased, the curve will become smoother--to a point. Remember that for any
- increase in the fineness factor, there will be a proportional increase in the
- time it takes to draw a graph.
- The fineness factor also controls the step rate for polar graphs,
- parametric equations, and dif-eqs, although the latter two are not quite as
- easy to control (you may need to adjust the fineness manually in some cases).
- To change the fineness factor, select Fineness from the Options menu. Any
- value greater than zero is valid, but I would not recommend going below 0.25,
- as the image quality suffers and the graphs begin to look like modern art.
- Also, a factor greater than 5 may overflow internal data structures and
- actually cause the graph to display incorrectly when the screen is redrawn.
- Press PgDn for help on other options.
- MISCELLANEOUS OPTIONS
-
- AutoRedraw - Turn AutoRedraw on/off and set the number of equations that are
- redraw automatically after each grid change. This option is described in
- detail in the Redraw help file.
-
- Warnings - Turn display of Warning Error messages (those like Division by zero
- that can be ignored except for a few points) on or off. By default, these
- warning messages are suppressed, because they slow down graphing and cover
- up the equation. If something goes wrong and you don't know why, you can
- turn on the warning messages using this option and redraw it to see what
- the problem is.
-
- Tables - Turn printer output of tables of plotted points on or off. This
- feature is useful in some cases but slow (and wastes paper)
-
- Draw Mode - Graphmatica can render graphs either by just drawing a dot for
- each point it calculates or by drawing lines to "connect the dots." By
- default, graphs are drawn using lines, since it is only a little slower and
- this makes the graphs much more visible. If you want, however, you can
- change the drawing mode to "dots" using this command.
-
- ───────────────End of Options help. Press ESC to return to menu.──────────────
-