ds.log | R Documentation |
Computes the logarithms for a specified numeric vector.
This function is similar to the R log
function. by default natural logarithms.
ds.log(x = NULL, base = exp(1), newobj = NULL, datasources = NULL)
x |
a character string providing the name of a numerical vector. |
base |
a positive number, the base for which logarithms are computed.
Default |
newobj |
a character string that provides the name for the output variable
that is stored on the server-side. Default |
datasources |
a list of |
Server function called: log
ds.log
returns a vector for each study of the transformed values for the numeric vector
specified in the argument x
. The created vectors are 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()
# Log onto the remote Opal training servers
connections <- DSI::datashield.login(logins = logindata, assign = TRUE, symbol = "D")
# Calculating the log value of the 'PM_BMI_CONTINUOUS' variable
ds.log(x = "D$PM_BMI_CONTINUOUS",
base = exp(2),
newobj = "log.PM_BMI_CONTINUOUS",
datasources = connections[1]) #only the first Opal server is used (study1)
# clear the Datashield R sessions and logout
datashield.logout(connections)
## End(Not run)
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