The DOS version runs on

- The Redraw Queue. Graphmatica remembers the last 25 equations you typed in or loaded from a file. You can save your work for use in a later session or with any text editor or Graphmatica 1.6 for Windows.
- Automatic functions. Graphmatica will automatically
- determine the type of graph you are entering based on the variables used,
- recognize an equation's domain if you include one,
- alter the sampling rate dynamically while graphing to make sure steep graphs like y=tan x are tracked correctly,
- adjust the x/y ratio when you reset the range so proper aspect ratio is maintained,
- redraw the most recently-entered equation(s) when you change the size or shape of the grid by any means, and
- restore the grid and special options settings when you load an equation list that has them.

- Advanced equation parser follows mathematical rules--not the computer's. You can use implied multiplication, a complete library of math functions (including trig), and even leave out those annoying parentheses in appropriate places. Forget about isolating variables before graphing! As long as there is only one instance of the dependent variable in the equation, Graphmatica will isolate it for you, and even graph relations. You also get the power of 6 styles of graphing: regular Cartesian, polar, parametric, and slope-field and initial-value approximations for up to fourth-order ODEs (and fourth- order linear systems as well), all detected automatically. Cartesian inequalities are supported as well.
- Convenient controls: the status bar displays relevant information about the selected equation, and help or error messages, and the Redraw Queue combobox lets you select any equation in memory to graph, delete, or edit to form a new equation.
- Pause and Print tables options let you see the coordinates of points on your graphs... as they are drawn. Print tables shows values at whole-number intervals so you can practice sketching curves yourself.
- Convenient mouse-oriented operations. You can use the mouse to select a new range or view the coordinates of a point, select the initial value for an ODE, and even find the tangent line of a curve or integrate a function without pressing a single key.
- Flexible graph paper. Choose between regular graph paper and paper appropriate for trig, polar, and logarithmic functions, at four levels of detail.
- Powerful symbolic and numerical calculus features. Find derivatives, integrals, and critical points for any Cartesian function.
- Lots of output options. Graphmatica lets you export your graphs to a standard PC-Paintbrush (.PCX) file for inclusion into other documents, or print directly to any Epson-compatible dot-matrix or HP DeskJet, LaserJet, or compatible inkjet or laser printer.
- Every automatic option is also user-settable to give you absolute control over your graphs. And the Save Setup Info command lets you save your preferences so they are automatically restored whenever you run Graphmatica.
- Instructive help topics explain the basics of each type of graph, online help lets you brush up on most features without exiting the program, and included demo files show you examples of each form of equation. See the section below for a list of these files.

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kSoft, Inc. ksoft@graphmatica.com Last updated: Mon 17 May 1999