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colMeans in a data.frame with numeric and character data
4 messages · Diogo André Alagador, Dimitris Rizopoulos, Douglas Bates +1 more
try this: dat <- data.frame(x = rnorm(10), y = rexp(10), z = letters[1:10]) colMeans(data.matrix(dat[sapply(dat, is.numeric)])) I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm Quoting Diogo Andr? Alagador <dalagador at armail.pt>:
Hi all, I would like to know if it is posible by, someway, to get colMeans from a data.frame with numeric as well as character data, dispersed all over the object. Note that I would like to get colMeans neglecting character data. I am really in need of some function proceeding in that way
All the best Diogo Andr? Alagador [[alternative HTML version deleted]]
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On Thu, Mar 27, 2008 at 3:05 PM, Dimitris Rizopoulos
<Dimitris.Rizopoulos at med.kuleuven.be> wrote:
try this: dat <- data.frame(x = rnorm(10), y = rexp(10), z = letters[1:10]) colMeans(data.matrix(dat[sapply(dat, is.numeric)]))
Alternatively
sapply(dat, mean)
x y z -0.5260131 1.0523121 NA Warning message: In mean.default(X[[3L]], ...) : argument is not numeric or logical: returning NA If you don't like the warning message showing up you can wrap the expression in suppressWarnings().
Quoting Diogo Andr? Alagador <dalagador at armail.pt>:
> Hi all, > > I would like to know if it is posible by, someway, to get colMeans from > a data.frame with numeric as well as character data, dispersed all over > the object. Note that I would like to get colMeans neglecting character > data. > > I am really in need of some function proceeding in that way? > > All the best > > Diogo Andr? Alagador > > [[alternative HTML version deleted]] > >
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
summaryBy in the doBy package can do that. The builtin iris data set has 4 numeric columns and one factor column:
library(doBy) summaryBy(.~1, iris, fun = mean, keep = TRUE)
Sepal.Length Sepal.Width Petal.Length Petal.Width 1 5.843333 3.057333 3.758 1.199333 On Thu, Mar 27, 2008 at 3:22 PM, Diogo Andr? Alagador
<dalagador at armail.pt> wrote:
Hi all,
I would like to know if it is posible by, someway, to get colMeans from
a data.frame with numeric as well as character data, dispersed all over
the object. Note that I would like to get colMeans neglecting character
data.
I am really in need of some function proceeding in that way?
All the best
Diogo Andr? Alagador
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.