19.9.2  Interactive plotting of solutions of a differential equation

The interactive_plotode or interactive_odeplot command draws interactive tangent fields of differential equations.

• interactive_plotode takes two arguments:
  • expr an expression depending on two or three variables, a time variable and one or two dependent variables.
  • vars, a list of the time variable and the dependent variable.
• interactive_plotode(expr,vars) draws the tangent field of the differential equation y′=expr (where y is the dependent variable) in a new window. In this window, one can click on a point to get the plot of the solution of y′=expr passing through this point.

  You can further click to display several solutions. To stop, press the Esc key.

Example

Solutions of the differential equation can be plotted by clicking on an initial point in the graphic screen (see Section 19.1.1).