how to plot implicit functions, witch given as matrix?

2018 7 4
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更新时间：2018 7 4
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I have this code
[t1, X] = ode23('vdpol', tspan, x0); [t2, Y] = ode23('vdpol', tspan, y0);
and I want to plot trajectories of points - 2D plot, shows Y(X) functions. But t1 and t2 are not the same time vectors, sometimes they have different sizes. Is any way to "approximate" X and Y vectors to plot then.

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回答（1 个）

Star Strider
Star Strider 2018-7-4

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‘... t1 and t2 are not the same time vectors ...’
You can make them be the same (for all intents and purposes) by defining ‘tspan’ as a vector of more than 2 elements.
This:
tspan = linspace(0, 10, 25);
creates ‘tspan’ as a vector going from 0 to 10, and having 25 elements. The ODE solvers will report solutions at each element of ‘tspan’.

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