(This article was first published on Greg's Research » R, and kindly contributed to R-bloggers)
Coercing variables of character and numeric type into a single dataframe yields all vectors to be defined as factors
all <- data.frame(cbind(site, year, model, x, y, z))
The following converts selected variables from “factor” back to “numeric”
all$x <- as.numeric(x)
all$y <- as.numeric(y)
all$z <- as.numeric(z)
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