make.groups {lattice}R Documentation

Grouped data from multiple vectors


Combines two or more vectors, possibly of different lengths, producing a data frame with a second column indicating which of these vectors that row came from. This is mostly useful for getting data into a form suitable for use in high level Lattice functions.




... one or more vectors of the same type (coercion is attempted if not), or one or more data frames with similar columns, with possibly differing number of rows.


When all the input arguments are vectors, a data frame with two columns

data all the vectors supplied, concatenated
which factor indicating which vector the corresponding data value came from

When all the input arguments are data frames, the result of cbind applied to them, along with an additional which column as described above.


Deepayan Sarkar

See Also



sim.dat <-
    make.groups(uniform = runif(200),
                exponential = rexp(175),
                lognormal = rlnorm(150),
                normal = rnorm(125))
qqmath( ~ data | which, sim.dat, scales = list(y = "free"))

[Package lattice version 0.15-4 Index]