Re: obtain values of a single contour

Hi Mark,
I'm sorry to hear you are having problems with this routine. I just ran a test using the plot value returned from
gsn_csm_contour as the input to get_isolines pretty much as you have it here. It ran without problems. I tried it both
with my development version of NCL on my mac and on our cluster using the release version of 6.1.2.

I would be happy to take a look at your code (and sufficient data to get it to run) to see if there is some other factor
coming into play here. I think you know the upload routine but just in case for reference it is detailed at http://www.ncl.ucar.edu/report_bug.shtml.
 -dave

On Apr 15, 2013, at 10:44 PM, <Mark.Collier@csiro.au> wrote:

> Hi Dave,
> the interface looked simple enough but my best attempt gave:
>
> fatal:NhlGetIsoLines: invalid contourplot id
> fatal:NhlGetIsolines: error retrieving isolines
> fatal:["Execute.c":8128]:Execute: Error occurred at or near line 251 in file plot_tropoh_climdiff.ncl
>
> what I tried was:
>
> plot0=gsn_csm_contour(wks,clim1_hist_ea,conres2)
>
> isolines = get_isolines(plot0,(/2.0/))
>
> where plot0 renders normally, and it contains the 2.0 contour level.
>
> I'm using version 6.1.2
>
> Thanks,
> Mark.
> ________________________________________
> From: David Brown [dbrown@ucar.edu]
> Sent: Tuesday, 16 April 2013 4:01 AM
> To: Collier, Mark (CMAR, Aspendale)
> Cc: ncl-talk@ucar.edu
> Subject: Re: obtain values of a single contour
>
> Hi Mark,
> I recently created a function that will do what you want. It is available in NCL 6.1.1 and later. Check out:
>
> http://www.ncl.ucar.edu/Document/Functions/Built-in/get_isolines.shtml
>
> -dave
>
>
> On Apr 15, 2013, at 12:41 AM, <Mark.Collier@csiro.au> wrote:
>
>> Hi,
>> I plot a single unique contour of a 2d array using @cnLevels = val using the gsn_csm_contour function.
>>
>> is there a way of obtaining the x-y values of that line from the plot?
>>
>> Regards,
>> Mark.
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Received on Tue Apr 16 13:57:47 2013