vlines animation problem

hi folks !

I'm working now quite a while with the matplotlib, also in the animated case
of plot_date and imshow charts.

Now I should use a vertical line (fixed to a plot_date plot, not to the
and I thought about using vlines as before.

But I have troubles to use the set_array method after the vlines are
Does anybody know the exact array shape and content ?

After I pass any possible combination to the set_array method, the
esablished lines turn gray (from green like they were construgted). They
also don't change the location as desired (they stay fix)

It isn't a problem of canvas redrawing, also autoscale() doesn't help (as it
helped me with animated imshow).

Does anyone have experiance with animated vlines ? eg a working code example

Thank you in advance,



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