lookup.xport: Describe the Contents of an SAS XPORT File

Description

Describe the contents of an SAS XPORT file.

Usage

lookup.xport(file)
"print"(x, ...)
"summary"(object, ...)
"print"(x, ...)

Arguments

file

Character string specifying the name or URL of a SAS XPORT file.

x, object

Object to be printed or summarized

...

Optional arguments

Value

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.

Details

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.

Examples

Run this code


## Get information about a local file
alfFile <- system.file('extdata', 'Alfalfa.xpt', package='SASxport')
lookup.xport(alfFile)

## Read a copy of test2.xpt available on the web:
## Not run: 
# url <- 'http://biostat.mc.vanderbilt.edu/wiki/pub/Main/Hmisc/test2.xpt'
# w <- lookup.xport(url)
# ## End(Not run)
## Or use the local copy...
testFile <- system.file('extdata', 'test2.xpt', package="SASxport")
w <- lookup.xport(testFile)


# 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