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[IDV #LCA-261543]: GrADS .ctl files

Hi Stefan-

On 4/21/11 11:23 AM, Stefan Cecelski wrote:
> I'll respond to both of your emails here.

that's fine.  I'm using the official Unidata tracking system to document the 

> In response to the two concurrent open files:
> The .ctl names are different, and access two totally different .dat 
> files with different file names. The multi-timestep .dat file is 
> 14.55GB. I also have other 1.33km horizontal resolution files at 37GB 
> which I will be testing on. I will test to see if I select single time 
> steps if it works. Maybe it has to do with opening too much data?

Okay. The problem is that the pointers to the data that were beyong 2GB are 
larger than an integer can hold so it would end up as a negative number.  I 
made a change to use longs instead of ints.

I updated the ncIdv.jar on RAMADDA, so please try that one.

> In response to the derived variables:
> Thanks very much, this clears it up. The attractiveness in using IDV for 
> visualization is the fact that I don't have to script the code to 
> calculate such things as IPV, Skew-Ts, ect. In fact, I had to write to 
> FORTRAN code to make ARWpost output for Equivalent Potential 
> Temperature. It is a SERIOUS pain in the butt, and would much rather 
> just have IDV do it! I presume I can manually create functions that will 
> select the right variables for derived quantities correct?

Here's something you can do (and I didn't know you could do this until I tried 
;-)).  From the IDV main menu, select Edit->Formulas->Edit Formulas->Derived 
Quantities and then the formula you want to use (e.g. Sounding Data (%N1% & 
%N2% only)).  In the Formula Editor dialog, click on the Derived Tab. In the 
Parameters section, add in the parameters that you want on the line under TEMP, 
DEWPOINT.  I used tc,td.  Click the Change Formula button.  Then, if you have 
the data source already loaded, you can right click on it and select Reload 
Data from the pop-up menu, or you can load in a new data source if you didn't 
have one.  Now, under derived, you should see the old one and a new one that 
says Sounding Data (tc,td only) in the list (near the bottom).  If you want it 
near the top, just switch the order of the Parameter lines in the Formula 

You'll notice that the next time you go through the Edit->Formulas menu, the 
edited formula will be tagged with <local>.  You haven't overwritten the system 
one, just created a local version.  If you mess up, you can always delete that 
one (Remove Formula button in the Formula Editor) and start again.


Ticket Details
Ticket ID: LCA-261543
Department: Support IDV
Priority: Normal
Status: Open

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