Mag. Ferri Leberl wrote on 4/6/2005 9:57 AM:
Dear everybody! I have load a list A of numbers and want a histogram to be drawn. on hist(Y) the Machine returns: Error in hist.default(A) : `x' must be numeric I found out, that the list is of type data.frame. Y<-as.numeric(Y) returns Error in as.double.default(A) : (list) object cannot be coerced to double What schould I do? Than you in advance!
The error messages cannot be more explicit. Y is a list (or data.frame). If you're trying to plot a histogram of a component in Y, use the "[[" or "$" extractors. E.g.
Y <- data.frame(x = rnorm(100)) hist(Y$x)
I would suggest you learn to use ?str if you don't know what Y is.
--sundar
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