Re: [matplotlib-devel] Last object added to the plot

[Paul I. <piv...@gm...>]

bu...@gm..., on 2011-04-04 05:15,  wrote:
> Hi,
> 
> Does matplotlib keep track of the last object added to the plot axes
> or its nature (line, text, collection, patch, etc.) ?
> If not, would it be feasible to implement something like this in
> matplotlib ?
> 
> This could be useful for interactive plotting, as it would allow a
> simple undo feature based on commands such as del ax.lines[-1].

Hi there,

I think this functionality already exists exactly as you
describe. ax.plot appends new lines to ax.lines, ax.scatter
appends new collection to ax.collections (via the
ax.add_collection method).

try this, and you'll see the cyan line is removed:

plt.plot([1,2,3],'r')
plt.plot([1,2,1],'c')
ax = plt.gca()
del(ax.lines[-1])
plt.draw()

-- 
Paul Ivanov
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