MaplePrimes - answers and comments on Question, how to plot with DEplot and odeplot in the polar coordinate?

Not directly with DEplot or odeplot

Adri vanderMeer van der Meer — Tue, 01 May 2012 12:39:02 Z

If you want to use the option coords = polar, then you must use the "normal" plot-command, to plot r(theta).

q1 := dsolve( {sys1, theta(0)=Pi, r(0)=2}, numeric, output=listprocedure);

This gives you numeric procedures for r(t) and theta(t).

Theta := subs(q1,theta(t)): R := subs(q1,r(t)):
plot( [R(t),Theta(t),t=0..10], coords=polar, axiscoordinates=polar );

a work around for DEplot in other coordinate syste...

John Starrett — Wed, 07 May 2014 18:55:03 Z

Here is another way to do it.

L1:= op(indets(DEplot({diff(x(t),t)=x(t)+x(t)^3-x(t)^5,diff(y(t),t)=1},
[x(t),y(t)], t=0 .. 12, [[x(0)=2.5,y(0)=1]],numpoints=1000),list(list(numeric)))):

plot(L1,coords=polar,scaling=constrained);

transformation

acer — Wed, 07 May 2014 20:36:13 Z

Could you not transform the plots with cartesian coordinates?

Download polarde.mw

acer