Hi,
rock[2,] is a data frame and you should not use sum() on a data frame, first
google hit for the error message gives
http://stackoverflow.com/questions/19697498/r-beginner-argument-is-not-numeric-or-logical-returning-na
Otherwise I think you should use
?rowSums and ?rowMeans if you have numeric data frames.
HTH,
daniel
________________________________________
Felad?: R-help [r-help-bounces at r-project.org] ; meghatalmazó:
Matthew Keller [mckellercran at gmail.com]
K?ldve: 2015. febru?r 11. 23:49
To: r help
T?rgy: [R] simple question - mean of a row of a data.frame
Hi all,
Simple question I should know: I'm unclear on the logic of why the sum of a
row of a data.frame returns a valid sum but the mean of a row of a
data.frame returns NA:
sum(rock[2,])
[1] 10901.05
mean(rock[2,],trim=0)
[1] NA
Warning message:
In mean.default(rock[2, ], trim = 0) :
argument is not numeric or logical: returning NA
I get that rock[2,] is itself a data.frame of mode list, but why the
inconsistency between functions? How can you figure this out from, e.g.,
?mean
?sum
Thanks in advance,
Matt
--
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com
[[alternative HTML version deleted]]
______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.