I have a data file with this format:
Weight Industry Type
251,787 Kellogg h
253,9601 Kellogg a
256,0758 Kellogg h
....
I read the data and try to draw an histogram with this commands:
ce <- read.table("file.txt", header = TRUE)
we = ce[,1]
in = ce[,2]
ty = ce[,3]
hist(we)
But I get this error:
Error en hist.default(we) : 'x' must be numeric.
What do I need to do in order to draw histograms for my three variables ?
Note that you could as well plot directly from ce
(after the comma removing) using the column name :
hist(ce$Weight)
(As opposed to using hist(ce[1])
, which would lead to the same "must be numeric" error.)
This also works for a database query result.
Use the dec argument to set ","
as the decimal point by adding:
ce <- read.table("file.txt", header = TRUE, dec = ",")
Source: Stackoverflow.com