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2007 Aug 31
3
by group problem
...each county that are over 65
County - the county in each state
State - the state in the US
There are about 3100 rows, with each row corresponding to a county within a state.
I want to return the top five "PercentOld" by state. But I want the County and the Value.
I tried this...
topN <- function(column, n=5)
{
column <- sort(column, decreasing=T)
return(column[1:n])
}
top5PerState <- tapply(data$percentOld, data$STATE, topN)
But this only returns the value for "percentOld" per state, I also want the corresponding County.
I think I'm close,...
2019 Sep 12
6
PGO is ineffective for Rust - but why?
Hi everyone,
As part of my work for Mozilla's Low Level Tools team I've
implemented PGO in the Rust compiler. The feature is
available since Rust 1.37 [1]. However, so far we have not
seen any actual performance gains from enabling PGO for
Rust code. Performance even seems to drop 1-3% with PGO
enabled. I wonder why that is and I'm hoping that someone
here might have experience