reshape2:::melt
, we melt data.frame
s and
matrix
s. This function is built for speed.
melt_(data, ...)
"melt_"(data, id.vars, measure.vars, variable.name = "variable", ..., value.name = "value")
"melt_"(data, ...)
data.frame
to melt.measure.vars
.id.vars
.logical
> integer
> numeric
>
character
.