Re: skewt_func()

From: Paul Scorer <paul.scorer01_at_nyahnyahspammersnyahnyah>
Date: Thu Feb 16 2012 - 02:27:42 MST

Well, Thank You for this; What it is to know the system!

I await your further observations with interest.

Thanks

PaulS

On Wed, 2012-02-15 at 14:27 -0700, David Brown wrote:
> Hi Paul,
>
> I agree with Mary that this like has nothing to do with the skewt
> code, and is more likely a problem in the NCL code itself.
> I was able to duplicate your problem with a simplified version of your
> code fragments, and unfortunately Mary's suggestion for a workaround
> does not help.
> I can also see that reversing the order of execution makes the problem
> go away. I will investigate further.
> FYI here is the runnable code that shows the problem:
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/skewt_func.ncl"
>
> procedure sounding()
> begin
> wks = gsn_open_wks("x11","test")
> skewt_bkgd = skewT_BackGround(wks, False)
> draw(skewt_bkgd)
> frame(wks)
> end
>
> procedure plot_contour()
> begin
> appid = NhlAppGetDefaultParentId()
> print(appid) ; if plot_contour is executed first this prints a valid object id -- if second it prints a missing value
> x =create "name" imageWorkstationClass appid
> end create
> end
>
>
> begin
> sounding()
> plot_contour()
> end
>
>
> On Feb 15, 2012, at 1:03 PM, Mary Haley wrote:
>
> > Hi Paul,
> >
> > I think this has to do with some weird parent/child stuff going on internally with the workstations.
> >
> > When you call gsn_open_wks, it creates a "default parent" for the workstations, of which I think only one can exist.
> >
> > Hence, when you call the "create" block to create an image workstation, the "defaultapp" that you are trying to use
> > is invalid. I think Dave would have to explain this.
> >
> > Maybe this would work inside of plot_contour:
> >
> > begin
> > appid = NhlAppGetDefaultParentId()
> > wks2 = create "name" imageWorkstationClass appid
> > …
> > end create
> > end
> >
> > --Mary
> >
> >
> > On Feb 14, 2012, at 10:30 AM, Paul Scorer wrote:
> >
> >> Greetings,
> >>
> >> [Maybe this is one for Dennis Shea: his name is all over the code :-) ]
> >>
> >> I have an interesting issue with skewt_func() (admittedly slightly
> >> modified)
> >>
> >> I hope the code outline below is enough to specify the problem.
> >>
> >>
> >> procedure sounding(...)
> >> begin
> >> wks = gsn_open_wks(...)
> >> skewt_bkgd = skewT_BackGround(wks, opts)
> >> draw(skewt_bkgd)
> >> skewt_data = skewT_PlotData(wks, skewt_bkgd, ...)
> >> frame(wks)
> >> end
> >>
> >> procedure plot_contour(...)
> >> begin
> >> create "name" imageWorkstationClass defaultapp
> >> ; wkHeight, Width, etc
> >> end create
> >> ...
> >> end
> >>
> >> If the above are called thus
> >>
> >> begin
> >> ...
> >> sounding(...)
> >> plot_contour(...)
> >> ...
> >> end
> >>
> >> then it bombs with
> >> fatal:_NclCreateHLUObjOp: Parent value is not an hlu object or is undefined
> >>
> >> Line number indicated is that of "end create". I get the same behaviour
> >> with xWorkStationClass (Both "sounding" & "plot_contour" use the same
> >> WorkStationClass).
> >>
> >> However, if called like this
> >>
> >> begin
> >> ...
> >> plot_contour(...)
> >> sounding(...)
> >> end
> >>
> >> Everything is OK (for both .png and X11)!
> >>
> >> Clearly the fix is obvious, but it would be nice to make the code fully
> >> bulletproof.
> >>
> >> Any ideas?
> >>
> >> Thanks
> >>
> >> PaulS
> >>
> >>
> >>
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Received on Thu Feb 16 02:31:13 2012

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