LaF (version 0.5)

read_dm_blaise: Read in Blaise data models

Description

Read in Blaise data models

Usage

read_dm_blaise(filename, datafilename)

Arguments

filename

The filename of the file containing the data model.

datafilename

The filename of the data file to which the data model belongs.

Value

• Returns a data model (which is a list containing all the relevant information to open a file using laf_open. When the file contains more than one data model a list of data models is returned and a warning issued.

Details

The function reads the data model from file and returns a list that can be used by laf_open to open the file for reading. Only a subset of the most common features found in Blaise files are supported. If part of the data model can not be parsed a warning is given.

See Also

See write_dm to write the data model to file. The data models can be used to open a file using laf_open.

Examples

# Generate test data
lines <- c(
    "1M 1.45Rotterdam ",
    "2F12.00Amsterdam ",
    "3  .22 Berlin    ",
    "M22   Paris     ",
    "4F12345London    ",
    "5M     Copenhagen",
    "6M-12.1          ",
    "7F   -1Oslo      ")
writeLines(lines, con="tmp.dat")

# Create a file containing the data model
writeLines(c( 
    "DATAMODEL test", 
    "FIELDS", 
    "id     : INTEGER[2]", 
    "gender : STRING[1]", 
    "x      : REAL[5] {comment}", 
    "city   : STRING[10]", 
    "ENDMODEL"), con="tmp.bla")
model <- read_dm_blaise("tmp.bla", datafilename="tmp.dat")
laf <- laf_open(model)