[gradsusr] tangential wind and radial wind in open grads

[Yi-Chih Huang]

Hello,

    Thanks much for the response.  I have installed Open GrADS on my
personal computer.  I can show wind vectors; but still the command "d
uv2trw(ua,va)" is not working.  All I got is "Cannot contour grid -- all
undefined values".  Could you tell me what should I do to make the function
uv2trw effect?
**    Thanks much,

                 Yi-Chih


On Fri, Jan 13, 2012 at 9:25 AM, Arlindo da Silva <dasilva at alum.mit.edu>wrote:

> On Thu, Jan 12, 2012 at 2:18 PM, Yi-Chih Huang <dscpln at gmail.com> wrote:
>
>> Hello,
>>
>>     I would like to caluculate both tangential wind and radial wind by
>> GrADS.  But GrADS does not recognize the command uv2trw with the error
>> message "Unknown command: uv2trw".
>
>
> You need the opengrads distribution to enable this command.
>
>
>>   It seems that the open grads is able to handle tangential wind and
>> radial wind on the web page of
>> http://gradsusr.org/pipermail/gradsusr/2009-February.txt.  I am not sure
>> what the differences between grades and open grads are.  Could you tell me
>> the command to show tangential wind/radial wind on open GrADS if you know
>> anything about it?
>>
>>
>>
> Search the list. I couple of months back I answered a similar question:
>
> As far functionality is concerned, by design, the OpenGrADS binaries<http://sourceforge.net/projects/opengrads/files/> have
> all the features that you find in the COLA binaries<http://grads.iges.org/grads/downloads.html>.
> In addition, it has a number of extra functions and commands<http://opengrads.org/doc/#udxt> that
> are not available with the COLA builds. OpenGrADS includes also binaries
> for a few platforms that have not been included in recent COLA builds
> (FreeBSD, IBM AIX).
>
> As far as installation is concerned, the OpenGrADS bundle<http://opengrads.org/wiki/index.php?title=Installing_the_OpenGrADS_Bundle> is
> designed to be a turn key system. On Unix/Linux/Mac OS X the tar ball
> includes all you need to run GrADS (maps, fonts, documentation, etc.) All
> you need to do is to start the binary and it works out of the box, no need
> to set any environment variable (although it is convenient to put the
> Contents/ directory in your path). The system is entirely relocatable in
> the sense you can put it on a USB men stick and run it from there with no
> setup necessary. The COLA builds of GrADS are also very straightforward to
> install, but requires you to do just a bit more (download separate data
> files, set environment variables).
>
> On Windows, the OpenGrADS superpack<http://opengrads.org/wiki/index.php?title=Installing_GrADS_v2.0_on_Microsoft_Windows> is
> also self contained and installs like a regular, native Windows application
> (self installing package). After download, it should take less than 2
> minutes for you to make your first plot.  Although the superpack is built
> on top of cygwin and requires an X server, it is all handled under the
> hood; all you have to watch for is the Windows firewalls. The superpack is
> also meant to be relocatable: put it on a USB stick and ran it anywhere, no
> setup necessary. COLA's windows build is also based on cygwin, but it
> requires a separate cygwin installation, download of an X server, and
> setting up environment variables. Again, not a big deal, but something that
> an average windows user without much command line exposure may find
> intimidating.
>
>
>    I hope this answers your question.
>
>        Arlindo
>
>
>
> --
> Arlindo da Silva
> dasilva at alum.mit.edu
>
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