[R] Factor Madness

Tony Plate tplate at acm.org
Wed Dec 19 00:29:15 CET 2007

 From ?cbind:

Data frame methods
The cbind data frame method is just a wrapper for data.frame(..., 
check.names = FALSE). This means that it will split matrix columns in data 
frame arguments, and convert character columns to factors unless 
stringsAsFactors = TRUE is passed.

(I'm guessing 'spectrum' is a data.frame before the code fragment you've shown)

hope this helps,

Tony Plate

Johannes Graumann wrote:
> Why is class(spectrum[["Ion"]]) after this "factor"?
> spectrum <- cbind(spectrum,Ion=rep("",
> nrow(spectrum)),Deviation.AMU=rep(0.0, nrow(spectrum)))
> slowly going crazy ...
> Joh
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