NANSUM same as SUM but ignores NaN's. 
 NANSUM is OBSOLETE; use SUMSKIPNAN instead. NANSUM is included 
    to fix a bug in some other versions. 

 Y = nansum(x [,DIM])
 
 DIM	dimension
	1 sum of columns
	2 sum of rows
	default or []: first DIMENSION with more than 1 element
 Y	resulting sum

 
 see also: SUM, SUMSKIPNAN, NANSUM 

Package: nan