Displaying 2 results from an estimated 2 matches for "testbi".
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2009 Nov 19
1
Performance of 'by' and 'ddply' on a large data frame
I've only recently started using R. One of the problems I come up
against is after having extracted a large dataset (>5M rows) out of
database, I realize I need another variable. In this case I have data
frame with dates. I want to find the minimum date for each value of x1
and add that minimum date to my data.frame.
> randomdf <- function(p) {
data.frame(x1=sample(1:10^4, 10^p,
2009 Aug 19
2
[Hmisc] latex() with ctable=T inserting unwanted empty line in .tex file when used on summary.formula(method="reverse") object
Dear useRs,
When I'm using Hmisc's latex() function with ctable=TRUE on a summary.formula with method="reverse" object and saving in a .tex file, the latter contains an unwanted empty line which makes compilation fail.
Here is a brief example :
library(Hmisc)
test <- data.frame(a=sample(1:30,10),b=sample(c("good","bad","ugly"),10,replace=T))