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jaap
2011 Mar 29
4
Simple but elusive - expand back from counts
Dear R-users,
This should be simple but still eludes me:
Given the following
tmp<-as.data.frame(matrix(c(44, 10, "abc", 1, 44, 10, "def", 1, 44, 12,
"abc", 2), 3, 4, byrow=T))
I want to expand the data to the following form:
V1 V2 V3 V4
1 44 10 abc 1
2 44 10 def 1
3 44 12 abc 1
4 44 12 abc 1
The last row of the original df was duplicated the row by the
2011 Aug 23
3
ddply - how to transform df column "in place"
Dear R-users,
I am trying to get the plyr syntax right, without much success.
Given:
d<- data.frame(cbind(x=1,y=seq(20100801,20100830,1)))
names(d)<-c("first", "daterep")
d2<-d
# I can convert the daterep column in place the classic way:
d$daterep<-as.Date(strptime(d$daterep, format="%Y%m%d"))
# How to do it the plyr way?
ddply(d2,
2011 Aug 12
1
lattice panel.abline use
Dear R-users,
I am unsuccessful in trying to add an horizontal line to all graphs in the
example below:
library(lattice)
val<-runif(15)
x<-rep(seq(1:5),3)
type<-c(rep("a",5), rep("b",5), rep("c",5))
xyplot(val ~ x | type, panel.abline(h=.6))
Any hints are appreciated.
Best regards,
---Jean
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