[gradsusr] tangential wind and radial wind in open grads

[Yi-Chih Huang]

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".  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?

    Thanks much for your help,

                       Yi-Chih
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