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Question: phase portrait

Question:phase portrait

skindog 16 Maple
ode differential-equation phaseportrait plotting
March 05 2008
0

Hi there

i'm trying to plot the phase portrait of a 2nd order ODE and i just cant get those damn arrows to come up. i've managed some solution curves but i'd like to see the phase portrait and maybe make an animation to see how it changes but i'll worry about that once i can get the arrows.

i've written the ODE out as a first order with 4 variables as i think this is needed but it still comes up with an error for my initial conditions (didnt think i needed any if not plotting a solution curve)  or the options. i've tried the DEplot, phaseportrait and dfield (dfiledplot? cant remember) commands and no luck.

any advice would be much appreciated.
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