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  • $\begingroup$ The point is I want to StreamPlot an arbitrary differential equation and not get the error messages above. $\endgroup$ Commented Sep 21, 2013 at 23:30
  • $\begingroup$ @Felix If you have differential equation like x''[t]=f[x,x'] then you can use StreamPlot[{v,f[x,v]},...]. The first argument of StreamPlot is the vector field, not coordinates. $\endgroup$ Commented Sep 21, 2013 at 23:33
  • $\begingroup$ Regardless of how StreamPlot is normally used, I want to have it plot {x[t], x'[t]}, where x and x' are the solutions to some differential equation. $\endgroup$ Commented Sep 21, 2013 at 23:38
  • $\begingroup$ @Felix I see your problem. I update my answer. I hope now it is more helpful. $\endgroup$ Commented Sep 21, 2013 at 23:50