[gradsusr] plot the average wind vector

[Yi-Chih Huang]

Hello,

    I am trying to plot the average wind vector over a horizontal range.
But I can't get an arrow, but only a value at most as below.  Could anyone
tell me the right commands to show the average wind vector over a
horizontal range?

ga-> d aave(u, x=65, x=93, y=37, y=65);aave(v, x=65, x=93, y=37, y=65)
Result value = -3.55342
ga-> d amean(u, x=65, x=93, y=37, y=65);amean(v, x=65, x=93, y=37, y=65)
Result value = -3.56684
ga-> d ave(u, x=65, x=93, y=37, y=65);ave(v, x=65, x=93, y=37, y=65)
Error from AVE: Invalid option flags
Operation Error:  Error from ave function
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = ave(u,x=65,x=93,y=37,y=65)

    Thanks much,

                   Yi-Chih
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