This site allows users to input a differential equation of the form f(x,y). Users are then provided with a sketch of the direction field for this differential equation. Users have the ability to adjust the window and the number of direction arrows displayed in each row/column. This plotter could be a helpful resource to Differential Equations students in that it provides a clear and simple visualization of the direction field.
This tool is designed to accompany a textbook on Differential Equations. The applet is simple but informative. The one-line interface allows the user to input a functions f(x,y), then the vector field is sketched. This applet provides a simple and effective illustration of a vector field. The graphical display is very clear and looks like a standard DE textbook illustration. Window settings for the graph can be entered independently.
The site containing the applet would benefit from some introductory text (outside of the help window) on vector fields. A link to such material would also be a plus.
A link to a more sophisticated field plotter is included in this stie. However, the link appears to be broken.
The single-line interface allows users to type in the differential equation of their choice. While the notation used for this line is “dy/dt”, it does allow users to input equations in terms of x rather than t. This may be a bit confusing for some users.