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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