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number or list surrounding_points_indexes ( fieldset,list ) Anchor surrounding_points_indexes surrounding_points_indexes
number or list surrounding_points_indexes ( fieldset,number,number )
Returns the indexes of the four gridpoints surrounding the given location, ordered by increasing distance from the target point. If a list is given, it must contain two numbers - latitude and longitude. If two numbers are given, the first is the latitude, the second the longitude. The field must be a gridded field. If the fieldset has only one field, a number is returned; otherwise a list is returned. Where it is not possible to generate a sensible value due to lack of valid data in the fieldset, nil is returned.
fieldset tan Anchor tanlat tanlat lat
( fieldset )
For each field in the input fieldset, this function creates a field where each grid point has the value of the tangent of its latitude. The resulting fields contain missing values on the poles.
fieldset Anchor thickness thickness thickness
( fieldset )
fieldset thickness
( fieldset,number )
fieldset thickness
( fieldset,list )
fieldset thickness
( fieldset,fieldset )
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