| reshapeLong {base} | R Documentation |
Reshape data frame to long format
Description
(EXPERIMENTAL). Convert data frame with repeated measurements in wide format with repeated observations in multiple variables across rows to long format, 1 row per observation.
Usage
reshapeLong(x, jvars, ilev=row.names(x), jlev=names(x)[jvars],
iname="reshape.i", jname="reshape.j", vname="reshape.v")
Arguments
x |
The data frame to convert |
jvars |
The variables to reshape by |
ilev |
Levels of 1st indexing factor |
jlev |
Levels of 2nd indexing factor |
iname |
Name of 1st indexing factor |
jname |
Name of 2nd indexing factor |
vname |
Name of variable holding the combined values of the "across" variables |
Details
This causes the values in jvars to be combined into a single
variable, all other variables being replicated the relevant number of
times. Two factors are added to the data frame indicating rows and
columns of the original data format.
Value
The reshaped data frame.
Bugs
There ought to be a way to have multiple sets of
jvars variables.
Note
The same substitution tricks are used for jvars as for the
select argument to subset. I.e.\ the argument is treated
as an expression and variables are replaced with their number in the
data frame, allowing ranges of variables to be specified.
See Also
reshapeWide, stack
Examples
(dd<-as.data.frame(matrix(1:24,4)))
reshapeLong(dd,V3:V5)