[R] convert factor data to numeric

[andreas]

I have yet another novice 'converting factors to numeric problem'.

The problem is as described by others: read data (using read.csv) in from
excel.csv file and it turns out to be a factor in R. The data in execl only
has 4 rows:

treat   absorb
0          1.8052
0.5       2.07075
1.0       2.2345

I read the object in as s1 and generated the following r-code and output
trying a couple of things:



as.numeric(as.character(s1))
[1] NA
Warning: 
> sapply(s1, class)
treat.absorb 
    "factor" 

> as.numeric(as.character(s1))
[1] NA
Warining:
NAs produced by conversion

> as.numeric(as.character(s1$absorb))
numeric(0)

> s1$absorb <- as.numeric(as.character(s1$absorb))
Error in `$<-.data.frame`(`*tmp*`, "absorb", value = numeric(0)) : 
  replacement has 0 rows, data has 3

thanks for your consideration

Andreas
-- 
View this message in context: http://r.789695.n4.nabble.com/convert-factor-data-to-numeric-tp1012855p2996406.html
Sent from the R help mailing list archive at Nabble.com.