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Computes the root mean square of a fieldset. A missing value in any field will result in a missing value in the corresponding place in the output fieldset. With n fields in the input fieldset, if xik x_i^k is the ith i^th value of the kth k^th input field and yi y_i is the ith i^th value of the resulting field, the formula can be written :

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For each field in the input fieldset, this function creates a field where each grid point has the value of the sine of its latitude. For example, the following macro adds the coriolis parameter to each grid point of a field :

# Computes absolute vorticity from vorticity
omega = 2 * pi / 86400
coriolis = 2 * omega * sinlat(vort)
absvort = vort + coriolis

fieldset sort ( fieldset )
fieldset sort ( fieldset,string )
fieldset sort ( fieldset,list )
fieldset sort ( fieldset,string,string )
fieldset sort ( fieldset,list,string )
fieldset sort ( fieldset,list,list )

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