How do you plot a phase diagram for {y',z'} = {{z},{y*(1-y^2)}}?

Questions
1

Its a system of nonlinear differential equations. I would really appreciate the help.

Thank you.

2

What have you tried so far?

3

I’ve tried stream plot (y*(1-y^2),x)
but I don’t know if this is the correct way of doing it.

4

That is not correct Wolfram Language syntax.

If you are beginning to learn the Wolfram Language syntax, this is a good place to start:

Let me know if this helps you or not.

5

It helped. Do you know of any other way to plot this?

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6

On the main website (not the mobile, I think) you can click the ‘Open Code’ button:

Annotation2019-10-22162504.png
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7

That should open a Wolfram Cloud notebook:

Annotation2019-10-22162603.png
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Does this answer your question?

8

Ok thank you for your time.

9

Sure, no problem.

Beyond that, might also look here:

https://mathematica.stackexchange.com/questions/14160/plotting-a-phase-portrait?noredirect=1&lq=1

Or, in general, search online for ‘wolfram phase diagram’ for more things to help you find relevant items (there is a lot more resources available to you in this area, including on https://demonstrations.wolfram.com )