[R] Working with time series class object

Hi I have a daily time series dataset, witch is very irregular spaced. The data is stored in a text file with the fields; day;month;year;stock1 price; stock2 price;...;stockN price The problem is that a script like described below, will result in a not very useful time count in the

[R] Object oriented programming: R x S+

I am interest in object oriented programming R I thought the R documentation about this subject is quit poor in relation to the S+ So, is there any major difference between R and S+ in this approach? in particularly, about formal definitional of a class The S+ manual could be a useful