ds.asInteger: Converts a server-side R object into an integer class

In datashield/dsBaseClient: DataSHIELD Client Functions

Converts a server-side R object into an integer class

Description

Coerces an R object into an integer class. This function is based on the native R function as.integer.

Usage

ds.asInteger(x.name = NULL, newobj = NULL, datasources = NULL)

Arguments

x.name	a character string providing the name of the input object to be coerced to an integer.
newobj	a character string that provides the name for the output object that is stored on the data servers. Default asinteger.newobj.
datasources	a list of DSConnection-class objects obtained after login. If the datasources argument is not specified the default set of connections will be used: see datashield.connections_default.

Details

This function is based on the native R function as.integer. The only difference is that the DataSHIELD function first converts the values of the input object into characters and then convert those to integers. This addition, it is important for the case where the input object is of class factor having integers as levels. In that case, the native R as.integer function returns the underlying level codes and not the values as integers. For example as.integer in R converts the factor vector:
[1] 0 1 1 2 1 0 1 0 2 2 2 1
Levels: 0 1 2
to the following integer vector: 1 2 2 3 2 1 2 1 3 3 3 2

Server function called: asIntegerDS

Value

ds.asInteger returns the R object converted into an integer that is written to the server-side. Also, two validity messages are returned to the client-side indicating the name of the newobj which has been created in each data source and if it is in a valid form.

Author(s)

DataSHIELD Development Team

Examples

## Not run: 
  ## Version 6, for version 5 see the Wiki
  
  # connecting to the Opal servers

  require('DSI')
  require('DSOpal')
  require('dsBaseClient')

  builder <- DSI::newDSLoginBuilder()
  builder$append(server = "study1", 
                 url = "http://192.168.56.100:8080/", 
                 user = "administrator", password = "datashield_test&", 
                 table = "CNSIM.CNSIM1", driver = "OpalDriver")
  builder$append(server = "study2", 
                 url = "http://192.168.56.100:8080/", 
                 user = "administrator", password = "datashield_test&", 
                 table = "CNSIM.CNSIM2", driver = "OpalDriver")
  builder$append(server = "study3",
                 url = "http://192.168.56.100:8080/", 
                 user = "administrator", password = "datashield_test&", 
                 table = "CNSIM.CNSIM3", driver = "OpalDriver")
  logindata <- builder$build()
  
  connections <- DSI::datashield.login(logins = logindata, assign = TRUE, symbol = "D") 
  
  # Converting the R object into an integer
  ds.asInteger(x.name = "D$LAB_TSC",
                  newobj = "int.obj",
                  datasources = connections[1]) #only the first Opal server is used ("study1")
  ds.class(x = "int.obj", datasources = connections[1])   
  
  # Clear the Datashield R sessions and logout                 
  datashield.logout(connections) 
  

## End(Not run)   

datashield/dsBaseClient documentation built on May 16, 2023, 10:19 p.m.