[gradsusr] Looping dimension does not vary

[Thomas Davies]

Hi,

I am having problems plotting a map of zonal winds from 0 to 90N and from
1000mb to 10mb, averaged from lon 0 to lon 360. Like the map below:

[image: Inline image 1]
This is part of my script:

*'set z 1 26'*
*'set lat 0 90'*
*'set t 50'*
*'d ave(ugrdprs,lon=0,lon=360)'*

And the error:

*Operation error:  Invalid dimension environment*
*  Looping dimension does not vary*


I'm not sure exactly what I'm doing wrong.. Any help would be greatly
appreciated.
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