cdiff question

[John Guhin]

In the grads documentation index (
http://grads.iges.org/grads/gadoc/gadocindex.html) for cdiff function, one
can find the following:


   1. define dv = cdiff(v,x) define dx = cdiff(lon,x)*3.1416/180 define
   du = cdiff(u*cos(lat*3.1416/180),y) define dy = cdiff(lat,y)*3.1416/180
   display (dv/dx-du/dy)/(6.37e6*cos(lat*3.1416/180))


Are the expressions for dv and du are correct?  What kind of difference will
be there if u and v components are 'grid relative' or 'earth relative'.

thanks in advance.




--
John Guhin
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