I have a data frame with a couple million lines and want to retrieve the largest and second largest values in each row, along with the label of the column these values are in. For example
row 1 strongest=-11072 secondstrongest=-11707 strongestantenna=value120 secondstrongantenna=value60 Below is the code I am using and a truncated data.frame. Retrieving the largest value was easy, but I have been getting errors every way I have tried to retrieve the second largest value. I have not even tried to retrieve the labels for the value yet. Any help would be appreciated Mike > data<-data.frame(value0,value60,value120,value180,value240,value300) > data value0 value60 value120 value180 value240 value300 1 -13007 -11707 -11072 -12471 -12838 -13357 2 -12838 -13210 -11176 -11799 -13210 -13845 3 -12880 -11778 -11113 -12439 -13089 -13880 4 -12805 -11653 -11071 -12385 -11561 -13317 5 -12834 -13527 -11067 -11638 -13527 -13873 6 -11068 -11698 -12430 -12430 -12430 -12814 7 -12807 -14068 -11092 -11709 -11607 -13025 8 -12770 -11665 -11061 -12373 -11426 -12805 9 -12988 -11736 -11137 -12570 -13467 -13739 10 -11779 -12873 -12973 -12537 -12973 -11146 > #largest value in the row > strongest<-apply(data,1,max) > > > #second largest value in the row > n<-function(data)(1/(min(1/(data[1,]-max(data[1,]))))+ (max(data[1,]))) > secondstrongest<-apply(data,1,n) Error in data[1, ] : incorrect number of dimensions > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
