min(expr, dim1, dim2 <,tinc>)
Returns the minimum of expr over the specified 
dimension range. If the specified dimension is time, an
optional time increment tincr may be specified.
expr    - any valid GrADS expression dim1    - the starting dimension expressiondim2    - the ending dimension expressiontinc    - optional time increment
dim1 and dim2 are standard
GrADS dimension expressions whose dimensions must match.
minloc, 
max, and
maxloc.