Description Usage Arguments Value
Compute the mean step.  If the step size is provided in the global attributes
then it is advised you use that information.  See ncglobal_atts()
| 1 | 
| NC | a ncdf4 class object | 
| dim_names | a two element character vector providing the names of the
x and y coordinates.  By default  | 
a 2 element numeric of the mean step size - always positive
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