ds.class | R Documentation |
Retrieves the class of an R object.
This function is similar to the R function class
.
ds.class(x = NULL, datasources = NULL)
x |
a character string providing the name of the input R object. |
datasources |
a list of |
Same as the native R function class
.
Server function called: classDS
ds.class
returns the type of the R object.
DataSHIELD Development Team
ds.exists
to verify if an object is defined (exists) on the server-side.
## 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")
# Getting the class of the R objects stored in the server-side
ds.class(x = "D", #whole dataset
datasources = connections[1]) #only the first server ("study1") is used
ds.class(x = "D$LAB_TSC", #select a variable
datasources = connections[1]) #only the first server ("study1") is used
# Clear the Datashield R sessions and logout
datashield.logout(connections)
## End(Not run)
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