[gradsusr] one simple question???

[Rashed Mahmood]

Hi all

I am trying to draw a diagram to show vertical meridional circulation. I
wrote a simple script to draw it:

'sdfopen D:\vcomp_month.nc'

'sdfopen D:\ucomp_month.nc'

'set t 1'

'set gxout vector'

'set lev 1000 300'

'set lat 0 60'

'define a = ave(vcomp.1,lon=100,lon=130)'

'define b = ave(ucomp.2,lon=100,lon=130)'

'd a;b'



It shows an error as follows:

"Operation error: Invalid dimension environment

Looping dimension does not vary"

Does any body know where I went wrong? I am using verion 2.9 on windows xp

Thanks

Rashed
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