private int GetVectorLength(ServerDataSource dataSource, string objectName)
{
int rcount = 0;
string comm = RCommandStrings.GetDataFrameColumnLength(dataSource, objectName);
object o = dispatcher.EvaluateToObject(comm, false);
if (o != null)
rcount = (int)o;
return rcount;
//return (int)dispatcher.EvaluateToUAReturn(RCommandStrings.GetDataFrameColumnLength(dataSource, objectName), false);
}