[yt-users] title of PlotCollection

[Pengfei Chen]

Hi,

I'm trying to add a title for the picture, but I can't find the right
command to do so. Here is the code:

pf = load(fn)
halos = HaloFinder(pf)
pc = PlotCollection(pf, [pos_x, pos_y, pos_z])
p = pc.add_slice("Density", 0)
pc.set_width(3*rad, '1')
p.modify["hop_particles"](halos, max_number=100, alpha=0.3)
p.modify["title"](halos, text='z=%.2f'%z)

And there is some error reported for the last line. The meaning of the
error is more than one name is given to the title. Then I replace it
with:

p.modify["text"](halos, pos=(0.02, 0.98), text='z=%.2f'%z)

But it still has error. Could someone please help me about it?

Pengfei