[ncl-talk] how to know the nearest grid point (i, j) to a known station(lat, lon)

[grace]

Hi,all:      I am wondering how to print the nearest grid point (i,j) of wrfout.nc data to a station(lat,lon),such as (35.2,113.6)?
    I want to know the nearest grid point (i,j) to a known station ,what should I do?
   I  know we can get the lat,lon location of  ij location, use wrf_user_ij_to_ll,but how to get the i,j   of lat,lon location

    Do NCL have such function?
    Or do you guys have some advice?
     any information will be appreciated
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