Re: [R] summing a large, partitioned data frame

check aggregate() (the examples are quite helpful) b On Mon, Jan 25, 2010 at 4:07 PM, wrote: > Dear R community, > I'm trying to develop a fast way of summing specific rows of a large data > frame. > Here is an example of the kind of data frames I'm dealing with: > >> refls > H K L M/I

[R] summing a large, partitioned data frame

Dear R community, I'm trying to develop a fast way of summing specific rows of a large data frame. Here is an example of the kind of data frames I'm dealing with: > refls H K L M/ISYM BATCH I SIGI 43247 1 0 5 2179 61.44117 2.20553 1040 1 0 5257 6 15.16316