j803 plot has a "cairo" output which generate png file directly, just like
the viewmat. You need to install the cairo addon and read its readme first.
This is independent of Qt.

Please see jwiki plot output options.
On Mar 3, 2015 10:34 PM, "Devon McCormick" <devon...@gmail.com> wrote:

> Has anyone succeeded in using plot under jconsole?  Is such a thing
> possible?
>
> I'm happy with the way "viewmat" has evolved in J8: under jconsole (under
> Windows), it spins off an independent .png file that appears in a separate
> view window and returns control to the session.
>
> However, when I try to run the examples in jwiki/Plot/Class, I get this
> error before my J session terminates:
> QWidget: Must construct a QApplication before a QWidget
>
> It looks like there's some Qt magic I need to do before attempting
> something as simple as this:
>    load 'jzplot'               NB. load plot class
>    a=: conew 'jzplot'     NB. create plot object a
>
> Has anyone done this?  If not, where might I look to figure this out,
> assuming it's even possible?
>
> Thanks,
>
> Devon
> --
> Devon McCormick, CFA
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