ds.Boole {dsBaseClient}

R Documentation

Converts a server-side R object into Boolean indicators

Description

It compares R objects using the standard set of Boolean operators (==, !=, >, >=, <, <=) to create a vector with Boolean indicators that can be of class logical (TRUE/FALSE) or numeric (1/0).

Usage

ds.Boole(
  V1 = NULL,
  V2 = NULL,
  Boolean.operator = NULL,
  numeric.output = TRUE,
  na.assign = "NA",
  newobj = NULL,
  datasources = NULL
)

Arguments

V1	A character string specifying the name of the vector to which the Boolean operator is to be applied.
V2	A character string specifying the name of the vector to compare with V1.
Boolean.operator	A character string specifying one of six possible Boolean operators: '==', '!=', '>', '>=', '<' and '<='.
numeric.output	logical. If TRUE the output variable should be of class numeric (1/0). If FALSE the output variable should be of class logical (TRUE/FALSE). Default TRUE.
na.assign	A character string taking values 'NA','1' or '0'. Default 'NA'. For more information see details.
newobj	a character string that provides the name for the output object that is stored on the data servers. Default boole.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

A combination of different Boolean operators using AND operator can be obtained by multiplying two or more binary/Boolean vectors together. In this way, observations taking the value 1 in every vector will then take the value 1 in the final vector (after multiplication) while all others will take the value 0. Instead the combination using OR operator can be obtained by the sum of two or more vectors and applying ds.Boole using the operator >= 1.

In na.assign if 'NA' is specified, the missing values remain as NAs in the output vector. If '1' or '0' is specified the missing values are converted to 1 or 0 respectively or TRUE or FALSE depending on the argument numeric.output.

Server function called: BooleDS

Value

ds.Boole returns the object specified by the newobj argument which 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()
  
  # Log onto the remote Opal training servers
  connections <- DSI::datashield.login(logins = logindata, assign = TRUE, symbol = "D") 

  # Generating Boolean indicators
  ds.Boole(V1 = "D$LAB_TSC",
           V2 = "D$LAB_TRIG",
           Boolean.operator = ">",
           numeric.output = TRUE, #Output vector of 0 and 1
           na.assign = "NA",      
           newobj = "Boole.vec",
           datasources = connections[1]) #only the first server is used ("study1")
           
  ds.Boole(V1 = "D$LAB_TSC",
           V2 = "D$LAB_TRIG",
           Boolean.operator = "<",
           numeric.output = FALSE, #Output vector of TRUE and FALSE 
           na.assign = "1", #NA values are converted to TRUE
           newobj = "Boole.vec",
           datasources = connections[2]) #only the second server is used ("study2") 
                      
  ds.Boole(V1 = "D$LAB_TSC",
           V2 = "D$LAB_TRIG",
           Boolean.operator = ">",
           numeric.output = TRUE, #Output vector of 0 and 1
           na.assign = "0", #NA values are converted to 0      
           newobj = "Boole.vec",
           datasources = connections) #All servers are used
  
  # Clear the Datashield R sessions and logout           
  datashield.logout(connections)

## End(Not run)
 

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