ds.levels | R Documentation |
This function provides access to the level attribute of
a factor variable stored on the server-side.
This function is similar to R function levels
.
ds.levels(x = NULL, datasources = NULL)
x |
a character string specifying the name of a factor variable. |
datasources |
a list of |
Server function called: levelsDS
ds.levels
returns to the client-side the levels of a factor
class variable stored in the server-side.
DataSHIELD Development Team
## 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")
# Example 1: Get the levels of the PM_BMI_CATEGORICAL variable
ds.levels(x = 'D$PM_BMI_CATEGORICAL',
datasources = connections)#all servers are used
ds.levels(x = 'D$PM_BMI_CATEGORICAL',
datasources = connections[2])#only the second server is used (study2)
# Example 2: Get the levels of the LAB_TSC variable
# This example should not work because LAB_TSC is a continuous variable
ds.levels(x = 'D$LAB_TSC',
datasources = connections)
# clear the Datashield R sessions and logout
datashield.logout(connections)
## End(Not run)
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