I have a problem where I cannot mesh up a square space and use contour

because there are many infeasible regions of the plot (no solution to

the equations of which I am plotting level curves). Here is an

example of the type of contour plot I am looking to achieve:

http://www.dlpeterson.com/levelcurve_test.pdf

The level curve lines in the .pdf above were generated by numerically

integrating the vectors that are tangent to the level curve. Given an

initial condition on the level curve, I can integrate forward and

backwards in the parameter to generate the whole level curve. The

problem is that this approach gives me numpy arrays that have the x,y

pairs for each point on the line. So I plot the level curves using

the plot command, but then I have no good way to label them.

Is it possible to label plot lines analogously to the way they show up

on clabel? I had to do all the line labeling by hand in Illustrator,

after I generated the plot, and it was a pain, and very time

consuming.

Thanks,

~Luke