Displaying 3 results from an estimated 3 matches for "geobotani".
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geobotany
2006 Oct 02
1
separation depending on equal contents in more than one field
Hi,
I have a dataframe:
(obs <- data.frame(a=c(1,2,2,3,3,3), b=c(1,2,3,4,4,5), c=1:2))
attach(obs)
In reality its about 1 million rows.
Some of the datasets have same contents in col a and! b like row 4 and 5.
I want to do some calculations on col c within the duplicated rows and
merge them afterwards:
layer <- function(x) round((1-prod(1-x/100))*100,0)
(covnew <- aggregate(c,
2007 Sep 24
2
Performance problems to fill up a dataframe
Dear Listmembers,
I'm trying to fill up a dataframe depending on an arbitrary list of
references:
Here is my code, which works:
dat <- data.frame(c(60001,60001,60050,60050,60050),c(27,129,618,27,1579))
LR <- sort(unique(dat[,1]))
LC <- sort(unique(dat[,2]))
m <- as.data.frame(matrix(data=NA, nrow=length(LR), ncol=length(LC),
dimnames=list(LR,LC)))
for(i in 1:nrow(dat)){
2011 Apr 27
0
Kruskal.test
Hello,
I've got a question concerning kruskal.test:
Is there any post-hoc test for kruskal.test like there is one for aov (TukeyHSD) and is it possible to plot this post-hoc test (if available). I need to find out, which of my sample-groups differ significantly from each other...
If not, is there any other approach to achieve the desired information?
Thanks in advance and have a nice day