Hello,
how can I get a variable driven summary of one column of my data.frame?
Usually I would do
> summary(data$columnname) to get a summary of column named
"columnname" of my data.frame named "data".
In my case the columnname is not static but can be set dynamically.
So I save the chosen columname in something like
variable <- "columnname"
but how can I now get the summary of the specified column?
summary(data$get("variable")) doesn't work.
summary(paste("data$", variable, sep="") doesn't work
either!
and if I try
summary(data[get("variable)] it gives me back a different result since
the data isn't a factor anymore but a list.
Thanks for the help,
Anne
Try: data[,variable] On Thu, Jun 25, 2009 at 6:44 AM, Anne Skoeries <home@anne-skoeries.de>wrote:> Hello, > > how can I get a variable driven summary of one column of my data.frame? > > Usually I would do > > summary(data$columnname) to get a summary of column named "columnname" of > my data.frame named "data". > > In my case the columnname is not static but can be set dynamically. > So I save the chosen columname in something like > variable <- "columnname" > but how can I now get the summary of the specified column? > > summary(data$get("variable")) doesn't work. > summary(paste("data$", variable, sep="") doesn't work either! > and if I try > summary(data[get("variable)] it gives me back a different result since the > data isn't a factor anymore but a list. > > Thanks for the help, > Anne > > ______________________________________________ > 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. >-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
On 6/25/2009 5:44 AM, Anne Skoeries wrote:> Hello, > > how can I get a variable driven summary of one column of my data.frame? > > Usually I would do >> summary(data$columnname) to get a summary of column named "columnname" > of my data.frame named "data". > > In my case the columnname is not static but can be set dynamically. > So I save the chosen columname in something like > variable <- "columnname" > but how can I now get the summary of the specified column? > > summary(data$get("variable")) doesn't work. > summary(paste("data$", variable, sep="") doesn't work either! > and if I try > summary(data[get("variable)] it gives me back a different result since > the data isn't a factor anymore but a list.vname <- "Species" summary(subset(iris, select=vname)) Species setosa :50 versicolor:50 virginica :50 vname <- "Sepal.Width" summary(subset(iris, select=vname)) Sepal.Width Min. :2.000 1st Qu.:2.800 Median :3.000 Mean :3.057 3rd Qu.:3.300 Max. :4.400> Thanks for the help, > Anne > > ______________________________________________ > 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.-- Chuck Cleland, Ph.D. NDRI, Inc. (www.ndri.org) 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894