Merge pull request #670 from dinesh110598/patch-2

Labeling error of axes

docs/src/examples/classical_physics.md

@@ -147,8 +147,8 @@ plot(sol, linewidth = 2, title = "Simple Pendulum Problem", xaxis = "Time",
 So now we know that behaviour of the position versus time. However, it will be useful to us to look at the phase space of the pendulum, i.e., and representation of all possible states of the system in question (the pendulum) by looking at its velocity and position. Phase space analysis is ubiquitous in the analysis of dynamical systems, and thus we will provide a few facilities for it.
 
 ```@example physics
-p = plot(sol, idxs = (1, 2), xlims = (-9, 9), title = "Phase Space Plot",
-    xaxis = "Velocity", yaxis = "Position", leg = false)
+p = plot(sol, vars = (1, 2), xlims = (-9, 9), title = "Phase Space Plot",
+         xaxis = "Angular position", yaxis = "Angular velocity", leg = false)
 function phase_plot(prob, u0, p, tspan = 2pi)
     _prob = ODEProblem(prob.f, u0, (0.0, tspan))
     sol = solve(_prob, Vern9()) # Use Vern9 solver for higher accuracy