Plotting an implicit curve

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Edoardo Cioffi 2023-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/1974459-plotting-an-implicit-curve

评论： Torsten 2023-5-27

I was wondering on how I could plot this curve :

I tried both 'fplot' and 'plot' but I kept getting this : 'Input must be a function handle or symbolic function. '. If I use 'fimplicit3' I get an empty graph.

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Edoardo Cioffi 2023-5-27

I solved a second order differential equation where the solutions of the characteristic polynomial are complex. Basically x3(t) and x4(t) are the state of position and velocity. I wanted to draw the phase plane and with some algebra you get the equation I wrote at the beginning. The values of the parameters can be all the positive numbers.

Torsten 2023-5-27

You might use plot3(t,x3,x4) or something similar after getting numerical arrays from the solution of your 2nd order ODE, but to do so, you don't need the equation from above.

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