Well, I had never seen any help pages use "attenu" as an example. Like
Jim I assumed that you were offering code that was operating on some
private copy of data, If you look at the number of datasets, I think
it unreasonable to expect the great majority of potentially helpful
persons to know all of them either.
So why were you trying to add a factor variable to a numeric, anyway?
If your hope was to convert those codes to numeric then it's a FAQ:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-do-I-convert-factors-to-numeric_003f
If the problem were more basic, and you did not know what was in that
dataset then the answer might have bee:
str(attenu)
--
David
On Sep 27, 2009, at 7:47 AM, tzygmund mcfarlane wrote:
Jim,
Both my emails contained reproducible code (the first one wasn't
completely reproducible - it required one to know that "attenu" is a
base R dataset).
Anyway, thanks for your help.
On Sat, Sep 26, 2009 at 8:11 PM, jim holtman <jholt...@gmail.com>
wrote:
I assumed (since you did not provide reproducible code) that 'mag'
was
a matrix. If 'station' is a matrix, then
mag + rowSums(station)
will work. If that does not work, then you need to tell us what your
data objects are.
On Sat, Sep 26, 2009 at 11:39 AM, tzygmund mcfarlane
<tzygm...@googlemail.com> wrote:
Hi Jim,
I might be missing something but your command gives the error:
Error in rowSums(mag) : 'x' must be an array of at least two
dimensions
#############################
data(attenu)
attach(attenu)
rowSums(mag) + rowSums(station)
attenu$new<-rowSums(cbind(mag, station))
#############################
Thanks
On Sat, Sep 26, 2009 at 4:30 PM, jim holtman <jholt...@gmail.com>
wrote:
Probably more efficient if you remove the 'cbind' which would
create a
combined matrix. Use the following:
rowSums(mag) + rowSums(station)
On Sat, Sep 26, 2009 at 11:16 AM, tzygmund mcfarlane
<tzygm...@googlemail.com> wrote:
Hi,
For very large matrices, is this the most efficient way to add two
variables together?
#############################
attach(attenu)
new<-rowSums(cbind(mag, station))
#############################
Also, could I be directed to some resources for working with very
large datasets?
Thanks
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
______________________________________________
R-help@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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
