@Rouben Rostamian  Wow, thank you very much!

@Rouben Rostamian  Oops sorry I thought I had attached an image of the differential equation as well. Here it is: 

I'm trying to get better at learning maple and am quite happy with solving differential equations of this form but not graphing them or with phase portraits. I hope that makes sense!

@Rouben Rostamian  

Plot a phase portrait of du/dt against u for v=2 and one for v=0.75 with initial conditions u(0)=0 and du(0)/dt=v

The previous question said to use epsilon=0.1 but im not sure if that applies here. I'm quite unfamiliar with what a phase portrait is to be honest.

I hope this clears things up

@rlopez Thank you for your reply,

I tried this using the following line:

phaseportrait(X=diff(X,t),X(t),t=-1 .. 2.5,number=1,[[X(0)=0],[D(X)(0)=0.75]]);

however it didn't seem to work and returned the error:

Error, (in DEtools/phaseportrait) initial conditions must be specified in inits

Is there anything that I can do to fix this?

Many thanks

@Kitonum Thank you very much, I did not know about not using square brackets.

Have a nice day!

@Kitonum Thank you very much!