Direction Field Plotter

\textrm{Given a scalar 1st order initial value problem } \; y' = f(t,y), \;\; y(t_0)=y_0 \;\; \textrm{ (} t \textrm{ is independent, } y \textrm{ dependent), this} \newline \textrm{demo plots the corresponding direction field, along} \textrm{ with solution curves through the specified initial conditions.}