Besides Georg's suggestion there is a file in
SAGEHOME/examples/calculus called field_plot2d.sage
which does some very crude DF plotting of 1st order ODEs.
(Designed specifically for teaching purposes.) You need to read it
into SAGE using the attach command, edg

sage: attach "SAGEHOME/examples/calculus/field_plot2d.sage"

The docstring of the file has examples.

On Sun, Jun 1, 2008 at 3:17 AM, Hobus <[EMAIL PROTECTED]> wrote:
>
> how can I plot the directional field of ordinary differential
> equations?
> x'=f(t,x)
> >
>

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