________________________________
From: Rui Barradas [via R] <ml-node+s789695n4636372h9 at n4.nabble.com>
To: jcrosbie <james at crosb.ie>
Sent: Thursday, July 12, 2012 3:12 PM
Subject: Re: remove loop which compares row i to row i-1
Hello,
I've not been following this thread but this seems ndependent from
previous posts. Try the following.
url <- "http://r.789695.n4.nabble.com/file/n4636337/BR3_2011_New.csv"
tUnitsort <- read.csv(url, header=TRUE)
cols <- sapply(c("Date", "Hour", "BlockNumber", "MyTo"), function(x)
? ? ? ? ? grep(x, names(tUnitsort)))
# This does it
# Use full data.frame 'tUnitsort' if you want
data.tmp <- aggregate(MyTo ~ Date + Hour, data = tUnitsort[, cols], max)
data.tmp <- merge(tUnitsort[, cols], data.tmp, by=c("Date", "Hour"))
# Make it pretty
idx <- grep("MyTo", names(data.tmp))
names(data.tmp)[idx] <- c("MyTo", "NewColumn")
# See it
head(data.tmp, 20)
tail(data.tmp, 20)
Also, you should quote the context. Many, almost all of us do NOT read
the posts on Nabble. And Nabble does have a "quote" button.
Hope this helps,
Rui Barradas
Em 12-07-2012 18:55, jcrosbie escreveu:
Thank you,
I am sorry but I am still trying to figure out how to make the function
work.
I have a column called tUnitsort$BlockNumber which can range from 0 to 6.
I have another two columns with the date and the hour ending for the given
day.
Example
Date ? ? ? ? Hour ? BlockNumber ? MyTo ? NewColumn
2011-01 ? 1 ? ? ? ? ? 2 ? ? ? ? ? ? ? ? ? ? ? ? ? ? 140 ? ? 140
2011-01 ? 1 ? ? ? ? ? 1 ? ? ? ? ? ? ? ? ? ? ? ? ? 70 ? ? ? ? 140
2011-01 ? 1 ? ? ? ? ? 0 ? ? ? ? ? ? ? ? ? ? ? ? ? 0 ? ? ? ? ? 140
2011-02 ? 1 ? ? ? ? ? 2 ? ? ? ? ? ? ? ? ? ? ? ? ? 160 ? ? 160
2011-02 ? 1 ? ? ? ? ? 1 ? ? ? ? ? ? ? ? ? ? ? ? ? 70 ? ? ? ? 160
2011-02 ? 1 ? ? ? ? ? 0 ? ? ? ? ? ? ? ? ? ? ? ? ? 0 ? ? ? ? ? 160
2011-03 ? 1 ? ? ? ? ? 2 ? ? ? ? ? ? ? ? ? ? ? ? ? 150 ? ? 150
I want to create a NewColumn which will place the MyTo number for the
highest block number for the rest blocks in a given hour ending within a
day.
ifelse(tUnitsort[,4]>=tUnitsort[-1,4],tUnitsort[,7],tUnitsort[-1,7])
I am unsure how to refference the element before in this case. ? I thought
the -1 was doing this but I believe I'm wrong now.
http://r.789695.n4.nabble.com/file/n4636337/BR3_2011_New.csv
BR3_2011_New.csv
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