If you are a math student or teacher or just a person who is interested in high-school algebra or college calculus, I would recommend you this program. Graphmatica presents an interactive algebraic equation grapher that can be used as an aide to plotting mathematical curves. Graphmatica remembers up to the last 999 equations you typed in or loaded from a file.

You can choose between six styles of graphing: regular Cartesian, polar, parametric, slope-field and initial-value approximations and so on.

The interface of Graphmatica is the co-ordinates. To make a graph on these co-ordinates you can type a new equation in the Redraw Queue combobox at any time as long as you aren't currently graphing one and second to retrieve old equations from the queue. If you want to enter a new equation, just type it in and press enter or click Graph to graph it. If a previous equation is highlighted on the input line, just start typing to start from scratch or press a direction key to clear the selection and edit it. To retrieve an old equation, use the up and down arrow keys to scroll through the list one equation at a time or click on the icon to the right of the edit field to drop down the list box for mouse selection (if there are more equations in the queue than fit in the box, it will have a scrollbar so you can see them all). You can also select equations just by clicking on their graphs.

Also, you can introduce certain points through which your graph passes. With these purposes you should use the Point Tables window, which shows the coordinates of selected points. In this case you have to type the program's internal representation.

To make up an appropriate equation after having introduced coordinates you may use "Global Settings" where you can choose an equation type and introduce the maximum number of iteration.

The bottom of the main window holds the Status Bar, which displays help messages from the menus, the result of the latest action completed, the status of a selected equation, and during graphing, the equation being graphed, any warning error messages, and the pause message. So, as not to obstruct the graphs, any message that does not require immediate attention or input will be posted in the Status Bar.

In conclusion, I should say that Graphmatica is a powerful but easy-to-use tool with numerical and calculus features, which can be very useful for people dealing with high-school algebra or college calculus.

Graphmatica keywords: algebra, calculus, graphing, equations, functions