[gradsusr] possible bug in define mode

[Stefano Materia]

Hi everyone,

I am using Grads 2.0.0.oga.1 and I am facing an odd issue.
When I try to define an expression for plotting wind vectors in this way:

define wind=skip(uw,8,8);vw

(where uw and vw are the two horizontal components), I get the following 
error:

Syntax error: expected operator or ')'
Error occurred at column 23

Grads displays wind arrows in a proper way, instead, when I plot the 
expression directly:

d skip(uw,8,8);vw

Bets regards,
Stefano Materia