GeoffH's profile - activity

2019-04-04 21:46:03 +0200	received badge	● Famous Question (source)
2016-09-06 03:30:52 +0200	received badge	● Notable Question (source)
2016-04-14 19:47:13 +0200	received badge	● Popular Question (source)
2015-03-24 05:05:31 +0200	commented answer	My first question: When using desolve_system_rk4(), is there a way to see the plots of the dependent variables vs. the independent variable? Thanks. wow...I'm amazed at how helpful that is. I didn't understand how desolve_system_rk4 worked, so I couldn't work out how to get the tx and ty curves. Now I have a much better idea of both...thanks!
2015-03-24 00:13:06 +0200	asked a question	My first question: When using desolve_system_rk4(), is there a way to see the plots of the dependent variables vs. the independent variable? Thanks. `x,y,t=var('x y t') #x=function('x',t) P=desolve_system_rk4([x(1-y),-y(1-x)],[x,y],ics=[0,0.5,2],ivar=t,end_points=20) P=P+desolve_system_rk4([x(1-y),-y(1-x)],[x,y],ics=[0,0.3,2],ivar=t,end_points=20) Q=[ [i,j] for i,j,k in P] LP=list_plot(Q) # Q=[ [j,k] for i,j,k in P] Q=[ [j,k] for i,j,k in P] LP=list_plot(Q) show(LP) plot(x);plot(y) #Doesn't work`