Sorry, I don't think I gave what you asked for, but cumprod() may still help.
Chuck Cleland wrote: > How about applying cumprod to the columns and then subsetting the result? > > apply(mydata, 2, cumprod)[12:30,] > > ?cumprod > > r user wrote: >> I have a dataframe of numeric values with 30 “rows” >> and 7 “columns”. >> >> For each column, beginning at “row” 12 and down to >> “row” 30, I wish to calculate the “rolling 12 row >> product”. I.e., within each column, I wish to >> multiply all the values in row 1:12, 2:13,…19:30. >> >> I wish to save the results as a new dataframe, which >> will have 19 rows and 7 columns. >> >> ______________________________________________ >> R-help@stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >> > -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 452-1424 (M, W, F) fax: (917) 438-0894 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
