ds.colnames | R Documentation |
Retrieves column names of an R object on the server-side.
This function is similar to R function colnames
.
ds.colnames(x = NULL, datasources = NULL)
x |
a character string providing the name of the input data frame or matrix. |
datasources |
a list of |
The input is restricted to the object of type data.frame
or matrix
.
Server function called: colnamesDS
ds.colnames
returns the column names of
the specified server-side data frame or matrix.
DataSHIELD Development Team
ds.dim
to obtain the dimensions of a matrix or a data frame.
## 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 column names of the R objects stored in the server-side
ds.colnames(x = "D",
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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