You could convert your data from a wide format to a long format using
the reshape function in base R:
DF2 <- reshape(DF, direction="long",
idvar=names(DF)[1:3],
varying=c("site1_elev", "site1_temp", "site2_elev", "site2_temp"),
v.names=c("elev", "temp"),
times=1:2,
timevar = "siteID")
rownames(DF2) <- NULL
DF2
year month day siteID elev temp
1 2000 5 6 1 1300 20
2 2000 5 7 1 1300 21
3 2000 5 8 1 1300 19
4 2000 5 9 1 1300 22
5 2000 5 6 2 1500 21
6 2000 5 7 2 1500 22
7 2000 5 8 2 1500 20
8 2000 5 9 2 1500 23
Philip
On 23/10/2016 4:50 AM, lily li wrote:
Hi R users,
I want to melt a dataframe, but it mixed up the variables.
DF is the original dataset:
year month day site1_elev site2_elev site1_temp site2_temp
2000 5 6 1300 1500 20 21
2000 5 7 1300 1500 21 22
2000 5 8 1300 1500 19 20
2000 5 9 1300 1500 22 23
How to melt the dataframe and get the following dataset? Thanks for your
help.
year month day siteID elev temp
2000 5 6 1 1300 20
2000 5 6 2 1500 21
2000 5 7 1 1300 21
2000 5 7 2 1500 22
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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