| lookup.xport {SASxport} | R Documentation |
Describe the contents of an SAS XPORT file.
lookup.xport(file) ## S3 method for class 'lookup.xport': print(x, ...) ## S3 method for class 'lookup.xport': summary(object, ...) ## S3 method for class 'summary.lookup.xport': print(x, ...)
file |
Character string specifying the name or URL of a SAS XPORT file. |
x, object |
Object to be printed or summarized |
... |
Optional arguments |
The lookup.xport function is a simple wrapper for the
lookup.xport function provided by the
foreign library. The wrapper adds the ability to handle URL's,
and returns an object of class lookup.xport for which
appropriate print, and summary functions are provided.
lookup.xport returns a list with one component for each dataset
in the XPORT format library.
summary.lookup.xport returns a single data frame containing:
dataset |
Dataset name, |
name |
Variable name, |
type |
Type of variable (one of 'character' or 'numeric'), |
format |
SAS format, |
width |
SAS format width, |
label |
Variable label, |
nobs |
Number of observations. |
For complete documentation of lookup.xport see the manual page
for lookup.xport.
## Get information on a local file
lookup.xport("Alfalfa.xpt")
## Or read a copy of test2.xpt available on the web:
## Not run:
host <- 'http://biostat.mc.vanderbilt.edu'
path <- '/cgi-bin/viewvc.cgi/*checkout*/Hmisc/trunk/tests/test2.xpt'
url <- paste(host,path,sep="")
w <- lookup.xport(url)
# display the information (calls 'print.lookup.xport')
w
# names of data sets
names(w)
# names of variables within data sets
w$Z$name
# use summary
wS <- summary(w)
wS # same display
# variable names within all data sets
wS$name
## End(Not run)