search for: mylightweightdatafram

Displaying 1 result from an estimated 1 matches for "mylightweightdatafram".

Did you mean: mylightweightdataframe
2004 Nov 26
2
Lightweight data frame class
...ould inherit from "list" and implement [,], [,]<- operators. It would also implement the "rownames" function that would return seq(nrow(x)), etc. It should also implement as.data.frame to avoid the overhead of conversion to a full-blown data.frame in calls like lm(y ~ x, data=myLightweightDataframe). Has anyone thought of this? Can you see any potential problems? Thanks, Vadim P.S. These are the timing results comparing data.frame operations to those of lists # make a 1e6 * 5 list > system.time(x <- lapply(seq(5), function(x) rnorm(1e6))) [1] 4.46 0.10 4.57 0.00 0.00 # conve...