ji.ds.log: Computes logarithms, by default natural logarithms
In datashield/ji.dev.cl: ji.dev.cl

Description Usage Arguments Value Author(s) Examples

This function is similar to R function log.

1 2	ji.ds.log(datasources = NULL, xvect = NULL, base = exp(1), newobj = NULL)

`datasources`	a list of opal object(s) obtained after login in to opal servers; these objects hold also the data assign to R, as `dataframe`, from opal datasources.
`xvect`	a vector.
`newobj`	the name of the new variable. If this argument is set to NULL, the name of the new variable is the name of the input variable with the suffixe '_log' (e.g. 'LAB_TSC_log', if input variable's name is 'LAB_TSC')

a message is displayed when the action is completed.

Gaye, A. (amadou.gaye

{

# load that contains the login details
data(logindata)

# login and assign specific variable(s)
myvar <- list("LAB_TSC")
opals <- datashield.login(logins=logindata,assign=TRUE,variables=myvar)

# Compute natural logarithm of LAB_TSC
ji.ds.log(datasources=opals, xvect=quote(D$LAB_TSC))

# Compute natural logarithm of LAB_TSC with base 2
ji.ds.log(datasources=opals, xvect=quote(D$LAB_TSC), base=2)

}