[gradsusr] tangential wind and radial wind in open grads

[Arlindo da Silva]

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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