Dear expeRts,
I have two questions concerning data frames:
(1) How can I apply the class function to each component in a data.frame? As
you can see below, applying class to each column is not the right approach;
applying it to each component seems bulky.
(2) After transforming the data frame a bit, the classes of certain components
change to factor. How can I remove the factor structure?
Cheers,
Marius
x <- c(2004:2010, 2002:2011, 2000:2011)
df <- data.frame(x=x, group=c(rep("low",7), rep("middle",10), rep("high",12)),
y=x+100*runif(length(x)))
## Question (1): why do the following lines do not give the same "class"?
apply(df, 2, class)
class(df$x)
class(df$group)
class(df$y)
df. <- as.data.frame(xtabs(y ~ x + group, data=df))
class(df.$x)
class(df.$group)
class(df.$Freq)
## Question (2): how can I remove the factor structure from x?
df.$x <- as.numeric(as.character(df.$x)) # seems bulky; note that
as.numeric(df.$x) is not correct
class(df.$x)
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