[ncl-talk] dummy wks for get_isollines()- best/better practice?

[Rick Brownrigg]

Hi Alan,

I'm not expert at this, but to the best of my knowledge, get_isolines is
the only way (currently) to get at the contour lines, and it is
fundamentally based upon the contour plot object. So your approach is
pretty much what is required.

There should be no hidden files being created however -- at most, there may
be an empty file with the name you gave to the gsn_open_wks() call.  For
PNG output however, the file is not created until the workstation is
"cleared", which is invoked by a  "frame()", so you shouldn't be seeing any
plot output files from your script. (is this true?).   This is not the case
for ps/pdf/svg output, where the plotfile is created upon workstation open.

Hope that answers your questions....
Rick


On Mon, Jan 11, 2016 at 9:51 AM, Alan Brammer <abrammer at albany.edu> wrote:

> Hi all,
>
> I’m writing a function that utilises the get_isollines function.  I don’t
> want a plot however, so am currently generating a png workstation then
> creating a plot but never drawing or framing.  This works fine and seems to
> be fast enough for now, just wondering if there is a cleaner way?
>
>  Am I unnecessarily creating a hidden png somewhere on my filesystem or
> does that not happen until draw and frame are called?
> If there are system calls occurring in the background is there any
> difference (in terms of computation time) about the type of “fake”
> workstation I create?
>  Is it possible to use get_isollines without the dummy wks and plot calls
> .e.g Is there a background marching squares algorithm already setup for
> wrapping into NCL?
>
> Thanks,
>
> Alan.
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