online computer algebra system

[DrHuang.com]

mathHandbook - Online symbolic math software
DrHuang.com
DrHuang Pty Ltd
Phone: (61) 043008019 www.mathHandbook.com
It is an online symbolic math and computer algebra system. It can perform exact, numeric, symbolic and graphic computation, e.g. any order of derivative, fractional calculus, solve equation, and user-defined functions, linear regression, symbolic differentation and integration, pattern-match. It is a programming language, in which you can define conditional, case, piecewise, recursive, multi-value functions and procedures, derivatives, integrals and rules. You have choice to run VisualMath or SymbMath engine. Their syntaxes are some different. Both syntaxes are case-sensitive. A first letter of each word in VisualMath keywords is upper-case, but all keywords are lower case in SymbMath. Please type expressions into the Input panel, or double- click on the Keyword panel, or click the Open menu to open a file. For evaluation of a function exp(x), first input n(exp(1)) into the Input panel, then click the Run menu to get the function value. For plotting functions, run plot(x^2,x). Click on the "Zoom In" or "Zoom Out" menu under the Graph menu to zoom. For plotting data, click the Import Data menu to import data file. You can fit any function to data by comparing data and function curves. Click the Linear Fit menu for linear regression. Find coordinates by clicking, get the initial value to the "x=" field by double-clicking, or zoom by drag, on graphics. You can copy-and-paste from and to your document by right-button clicking on the text field to pop-up menu. For second way of copy-and-paste, first select the text, then key in Ctrl+C (i.e. press the Ctrl key and the C key at the same time), then point to where you want to paste, and finally key in Ctrl+V (i.e. press the Ctrl key and the V key at the same time). For security reason, Open and Save files, and Print work only when it runs as local application. Its SymbMath engine works only when it runs in Microsoft Window. Please read SymbMath manual SymbMath.doc. If symbolic integration fails, you should add your integration rules into the library file integrate.txt in the vmath/library directory. You can develop your library, and save library files into the vmath/library directory. The library source codes are auto loaded when need. Please read document visualmath.doc or visualmath.doc.html. It runs in any computer that supports Java. If you see it online, it can run offline in your computer. It is all of Java applet, Java application and Window application. Run VisualMath.html as Java applet, run VisualMath.bat as Java application, or run VisualMath.exe as Window application.