I need to create a column ("rt") that sums up 50 selected columns in each row of a dataframe ("data"). I already have a vector named "rtvecnum" which contains the 50 columns' numbers needed to be summed.
- the first row of the dataframe is irrelevent for that purpose.
The first error referred to X not being numeric, hence the "as.numeric"... but then i got the second error of:
"error in evaluating the argument 'x' in selecting a method for function 'rowSums': 'list' object cannot be coerced to type 'double'".
This is where I got stuck.
I would appreciate your help guys...
data$rt <- rowSums(as.numeric(data[2:nrow(data), c(rtvecnum)], na.rm=TRUE))
