@Rouben Rostamian   i didn't know which we can do that by maple, really is so good, i saw a lot of phase portrait with a lot of design is been a while i am searching for finding and plot them this is good really, but the direction of trajectory is missing can we have the direction and point inside the plot are shown?

i saw a lot of phase portrait this is so good and i am looking for this code, and other code too for my work

@janhardo thank you so much 

@Rouben Rostamian  i have two question! one is personal :  regarding to your name are you persian?
secondly: how you give the initial condition to system is arbitrary?

@Rouben Rostamian  thank you so much, i will ask more question about this topic