Re: [R] Is there way to add a new row to a data frame in a specific location

This look really interesting but I don't understand what is happening. Please can someone explain the last line and what the bit in [] is doing. Ian df = data.frame( A=c('a','b','c'), B=c(1,2,3), C=c(10,20,30), stringsAsFactors=FALSE) newrow = c('X', 100, 200) rbind(df,newrow)[c(1,4,2,3),]

Re: [R] Adding two or more columns of a data frame for each row when NAs are present.

I think, here is the solution. If NA is included in read.table list the row becomes a factor: $ Q21: Factor w/ 3 levels 1, 2, NA: 1 2 3 2 2. This will not work with rowSums. If I put the missing value as a blank, then it is still read as NA but the whole row is considered as an integer and OK

Re: [R] Adding two or more columns of a data frame for each row when NAs are present.

Hi, Thanks, your method does indeed work. Thank you. Last night, I worked out something similar and found out about rowMeans as well. Kind wishes, Ian yy - read.table( header = T, sep=,, text = Q20, Q21, Q22, Q23, Q24 0,1, 2,3,4 1,NA,2,3,4 2,1, 2,3,4 5,NA,3,NA,NA) yy Q20 Q21 Q22 Q23 Q24

[R] Adding two or more columns of a data frame for each row when NAs are present.

I am fairly new to R and would like help with the problem below. I am trying to sum and count several rows in the data frame yy below. All works well as in example 1. When I try to add the columns, with an NA in Q21, I get as NA as mySum. I would like NA to be treated as O, or igored. I wrote