Description Usage Arguments Details Value Author(s) Examples
This function is similar to R function length
.
1 2 |
x |
a string character, the name of a vector |
type |
a character which represents the type of analysis to carry out.
If |
checks |
a boolean, if TRUE (default) checks that verify elements on the server side such checks lengthen the run-time so the default is FALSE and one can switch these checks on (set to TRUE) when faced with some error(s). |
datasources |
a list of opal object(s) obtained after login in to opal servers;
these objects hold also the data assign to R, as |
The function returns the pooled length or the length of the a vector or a list for each study.
a numeric, the number of elements of the input vector or list.
Gaye, A.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | {
# load that contains the login details
data(logindata)
# login and assign all the variables stored on the server side
opals <- datashield.login(logins=logindata,assign=TRUE)
# Example 1: Get the total number of observations across all the studies for the variable 'LAB_TSC' - default behaviour
ds.length(x='D$LAB_TSC')
# Example 2: Get the number of observations on each study, for the variable 'LAB_TSC'
ds.length(x='D$LAB_TSC', type='split')
# clear the Datashield R sessions and logout
datashield.logout(opals)
}
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