[gradsusr] undef bug in grads2!

[Muthuvel Chelliah]

Jennifer,

Thanks for the email and the wonderful explanation.
Wesley also dropped by and mentioned about the new
set/query undef feature in grads2. Reg. your sep.
email about the build for test version 2.0.1.p5, which incorporates
lterp (great!) I will talk to Don Garrett so some of us will
start testing it out.  So,all issues I raised are pretty much
taken care of.

There was one other thing, I forgot to mention earlier.
ie. in grads2 the lack of -u option (or the not working of it) as
we update the index file. This is particularly useful as we
update the existing long/big index file (starting from say 1948) when
we just add one current month in operations. I hope
I have made it clear.

Once again thank you much Jennifer!

Muthu
-----------------
On Thu, Oct 11, 2012 at 3:40 PM, Jennifer Adams <jma at cola.iges.org> wrote:

>
> On Oct 11, 2012, at 2:14 PM, Muthuvel Chelliah wrote:
>
> Hello Bryan and other grads developers,
>
> First of all thank you for all the great work you folks
> do. You must have heard about several small issues
> in grads2, that are yet to be resolved, for example,
> the lack of regrid2, etc. Because of this, in most
> of CPC operations, we are still using grads version 1.94,
> and not switched to grads2.
>
>
> Almost all the features of regrid (except the voting) have been
> incorporated into the lterp function. The documentation for lterp has been
> updated (http://iges.org/grads/gadoc/gradfunclterp.html), but this
> capability is not available in a public release yet. There is a build at
> CPC that you can use to try out the new features. I will send you the
> location offline.
>
>
> Here is another one to the list of grads 2 problems.
>
> In grads 2, I opened a file with undef explicitly
> set as  -999.0.
>
> I defined a variable and computed something,
> and write the values out via fwrite. For some
> reason, it is not using the same undef values
> as it is input control file, but has set the undef as:
> ga-> q undef
> Output undef value is set to -999000000.000000
>
> I was scratching my head, since it took me
> some time to figure this out.  This is definitely a bug,
> and please take a look at this.
>
> This is not a bug. It was a required change that goes back to version
> 2.0.a6 from June of 2009. Here is the notice from the ChangeLog:
>
>    * New commands "set undef" and "query undef" allow the user to
>       control the undefined data value for all forms of GrADS output.
>       This affects all the undefined values printed to screen in the
>       'gxout stat' and 'gxout print' output, as well as the undefined
>       values in fwrite, sdfwrite, and geotiff files.
>       The default output undef value is -9.99e8.
>       N.B. THIS FEATURE CHANGES THE DEFAULT BEHAVIOR OF GrADS!
>
> The documentation page for 'set undef' is at
> http://iges.org/grads/gadoc/gradcomdsetundef.html
> --Jennifer
>
>
>
> Thanks again for all your great efforts into grads,
> which is greatly appreciated by us all.
>
> Muthu
> --
>
> ------------------------------------------------------------------
> Dr.Muthuvel Chelliah, eMail:Muthuvel.Chelliah at noaa.gov
>
>
> Rm.3008, Climate Prediction Center, Ph:(301) 683-3393
> NCEP/NWS/NOAA/U.S.Dept.of Commerce,
> 5830, University Research Court, NCWCP
> College Park, MD 20740.
>
>
> _______________________________________________
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> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>
>
>  --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>
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>
>


-- 

------------------------------------------------------------------
Dr.Muthuvel Chelliah, eMail:Muthuvel.Chelliah at noaa.gov

Rm.3008, Climate Prediction Center, Ph:(301) 683-3393
NCEP/NWS/NOAA/U.S.Dept.of Commerce,
5830, University Research Court, NCWCP
College Park, MD 20740.
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