I think I understand where the misunderstanding originated!

I think I understand where the misunderstanding originated!

you can do an awful lot of basic cleaning for free; the company may offer a more thorough job for a fee but unless you run into a lot of problems with your machine you may not need it.

You can find ccleaner here, be sure to download the freeware version : http://www.filehippo.com/download_ccleaner

you can do an awful lot of basic cleaning for free; the company may offer a more thorough job for a fee but unless you run into a lot of problems with your machine you may not need it.

You can find ccleaner here, be sure to download the freeware version : http://www.filehippo.com/download_ccleaner

I meant that pointplot does not appear to show those spurious points located on the asymptote, if I'm not mistaken.

I meant that pointplot does not appear to show those spurious points located on the asymptote, if I'm not mistaken.

just a general comment -- it sounds like you're wanting to uninstall the program but it won't uninstall properly. What I'd do is delete all the files and folders associated with the installation that went wrong, restart and then run ccleaner (freeware) or some such "cleaner" to remove all the registry entries associated with the incorrect install, then restart and you should be ready for another attempt.

just a general comment -- it sounds like you're wanting to uninstall the program but it won't uninstall properly. What I'd do is delete all the files and folders associated with the installation that went wrong, restart and then run ccleaner (freeware) or some such "cleaner" to remove all the registry entries associated with the incorrect install, then restart and you should be ready for another attempt.

Thanks Scott,

I was indeed looking for some way to control the animation from within the code, both within the worksheet and in the exported gif.

I ran your lines of code, but that didn't do it. I'm afraid I don't know how to use the plot component. If I understand correctly your method works for standard, right? I was able to pull down something from the menu and a small window opened, but not sure how to proceed from there.

Patrick.

P.S. ideal would be a mouse-free, menu-free, window-free, code-based method, preferably in classic gui.

Thanks Scott,

I was indeed looking for some way to control the animation from within the code, both within the worksheet and in the exported gif.

I ran your lines of code, but that didn't do it. I'm afraid I don't know how to use the plot component. If I understand correctly your method works for standard, right? I was able to pull down something from the menu and a small window opened, but not sure how to proceed from there.

Patrick.

P.S. ideal would be a mouse-free, menu-free, window-free, code-based method, preferably in classic gui.

I just created an animated gif and found that the animation ran too fast, so naturally googled for some possible solution. I was immediately taken to this post... by me... from about one year ago! I had forgotten all about it, as often happens to me.

My question remains unanswered to this day.

Does anyone know of a Maple solution to control the speed of an animated gif?

I'm currently looking at an animation created with DEplot (full code below provided for replication). I know how to:

• animate the trajectories : animatecurves=true
• animate the vector field : animatefield=true
• animate both of the above: animate=true
• select the number of frames to be created in the animation: numframes=20

I would like to:

• select the speed of the animation, e.g. specifying frames per second: numframespersecond=1
• make the animation play continuously, e.g. play=continuous.
• make the animation play when created, e.g. alwaysplay=true

I have no interest in mouse-based context-menu solutions. I would like it all to work without fallible ad-hoc human intervention.

ode1 := diff(x(t),t)=-x(t)*(1-x(t)^2-y(t)^2)^2-y(t);
ode2 := diff(y(t),t)=-y(t)*(1-x(t)^2-y(t)^2)^2+x(t);

ic1:= [0,0.68,0.68]:
ic2:= [0,-0.68,-0.68]:
ic3:= [0,1.5,1.5]:
ic4:= [0,-1.5,1.5]:
ic5:= [0,1.5,-1.5]:
ic6:= [0,-1.5,-1.5]:

DEtools[DEplot](
  {ode1,ode2},
  {x(t),y(t)},
  t=0..20,
  [ic1,ic2,ic3,ic4,ic5,ic6],
  scene=[x(t),y(t)],
  x=-1.5..1.5, y=-1.5..1.5,
  arrows=smalltwo,
  dirfield=400,
  size=magnitude,
  color=magnitude, 
  linecolor=t,
  thickness=3,
  animatecurves=true,
  animatefield=true,
  numframes=20
);

I just created an animated gif and found that the animation ran too fast, so naturally googled for some possible solution. I was immediately taken to this post... by me... from about one year ago! I had forgotten all about it, as often happens to me.

My question remains unanswered to this day.

Does anyone know of a Maple solution to control the speed of an animated gif?

I'm currently looking at an animation created with DEplot (full code below provided for replication). I know how to:

• animate the trajectories : animatecurves=true
• animate the vector field : animatefield=true
• animate both of the above: animate=true
• select the number of frames to be created in the animation: numframes=20

I would like to:

• select the speed of the animation, e.g. specifying frames per second: numframespersecond=1
• make the animation play continuously, e.g. play=continuous.
• make the animation play when created, e.g. alwaysplay=true

I have no interest in mouse-based context-menu solutions. I would like it all to work without fallible ad-hoc human intervention.

ode1 := diff(x(t),t)=-x(t)*(1-x(t)^2-y(t)^2)^2-y(t);
ode2 := diff(y(t),t)=-y(t)*(1-x(t)^2-y(t)^2)^2+x(t);

ic1:= [0,0.68,0.68]:
ic2:= [0,-0.68,-0.68]:
ic3:= [0,1.5,1.5]:
ic4:= [0,-1.5,1.5]:
ic5:= [0,1.5,-1.5]:
ic6:= [0,-1.5,-1.5]:

DEtools[DEplot](
  {ode1,ode2},
  {x(t),y(t)},
  t=0..20,
  [ic1,ic2,ic3,ic4,ic5,ic6],
  scene=[x(t),y(t)],
  x=-1.5..1.5, y=-1.5..1.5,
  arrows=smalltwo,
  dirfield=400,
  size=magnitude,
  color=magnitude, 
  linecolor=t,
  thickness=3,
  animatecurves=true,
  animatefield=true,
  numframes=20
);

Indeed, Professor Keith Geddes very kindly replied to my email -- he doesn't have the maple files of the package; he gave me some hints on how to contact the other two authors, but none of my emails seem to have reached them.

perhaps it's a matter of asking the question at the right time, so let me try again: does anyone in the Maple community know a way to contact the authors of the centermanifold package and/or to locate the package itself? would be very grateful!

The reference is: The reference is: Computation of Center Manifolds, Nov 11, 2000, Robert Corless, Keith Geddes and Xianping Liu.

The paper is available online, so is Xianping Liu's PhD thesis, but the Maple files are no longer in their original repository ... are they still somewhere in cyberspace?

this doesn't answer your question, I'm pretty sure I've seen something like this before in Maple but I don't have the means to access my notes at this moment, so just off the top of my head, in the meantime, something with arrows:

ode1 := diff(x(t),t)=-x(t)*(1-x(t)^2-y(t)^2)^2-y(t);
ode2 := diff(y(t),t)=-y(t)*(1-x(t)^2-y(t)^2)^2+x(t);

ic1:= [x(0)=0.68,y(0)=0.68]:
ic2:= [x(0)=-0.68,y(0)=-0.68]:
ic3:= [x(0)=1.5,y(0)=1.5]:
ic4:= [x(0)=-1.5,y(0)=1.5]:
ic5:= [x(0)=1.5,y(0)=-1.5]:
ic6:= [x(0)=-1.5,y(0)=-1.5]:

DEtools[DEplot](
  {ode1,ode2},
  {x(t),y(t)},
  t=0..20,
  [ic1,ic2,ic3,ic4,ic5,ic6],
  scene=[x(t),y(t)],
  x=-1.5..1.5, y=-1.5..1.5,
  arrows=smalltwo,
  dirfield=400,
  size=magnitude,
  color=magnitude,
  linecolor=black,
  thickness=6,
  numpoints=1000
);