Merging subplots (Was: Re: subplot(1, 1, [...]) and pprint_getters)

Hi,

    > Now on to my real question. Say I have a screen of 4x4
    > subplots, created with subplot(221). I'd like to be able
    > to split the screen as such: __ __
    > > > >
    > >--| |
    > > > >
    > >__|__|

ax1 = subplot(221)
ax2 = subplot(223)
ax3 = subplot(122)

OK, that one was kind of easy, but more generally, is there a simple solution to 'merge' some axes (beside doing it manually), like subplot(1,3,[1,2]) for:

···

+---+-+

  > >

+---+-+

or any more complex layout?

(maybe someone remember there was such a functionnality under SuperMongo! see http://www.astro.princeton.edu/~rhl/sm/sm.html#SYN83)

Cheers.
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