Aggregate some data from the DataSHIELD R session using a valid R expression. The aggregation expression must satisfy the data repository's DataSHIELD configuration.
Arguments
- conn
An object that inherits from
DSConnection-class.- expr
Expression to evaluate.
- async
Whether the result of the call should be retrieved asynchronously. When TRUE (default) the calls are parallelized over the connections, when the connection supports that feature, with an extra overhead of requests.
Value
An object of class DSResult-class representing the result of the aggregation operation.
See also
Other DSConnection generics:
DSConnection-class,
dsAssignExpr(),
dsAssignResource(),
dsAssignTable(),
dsDisconnect(),
dsGetInfo(),
dsHasResource(),
dsHasSession(),
dsHasTable(),
dsIsAsync(),
dsKeepAlive(),
dsListMethods(),
dsListPackages(),
dsListProfiles(),
dsListResources(),
dsListSymbols(),
dsListTables(),
dsListWorkspaces(),
dsRestoreWorkspace(),
dsRmSymbol(),
dsRmWorkspace(),
dsSaveWorkspace(),
dsSession()
Examples
if (FALSE) { # \dontrun{
con <- dsConnect(DSOpal::Opal(), "server1",
username = "dsuser", password = "password", url = "https://opal-demo.obiba.org")
dsAssignTable(con, "D", "test.CNSIM")
dsAggregate(con, as.symbol("meanDS(D$WEIGHT)"))
dsDisconnect(con)
} # }