[R] ggplot2 melt function "value"

[hadley wickham]

> > Hi:I recently started using the melt function and
> > found that it is very useful and powerful,however I
> > can't seem to find the way to change the default
> > column header "value" to my custom column name.
>
> melted data are data frames. You can names[..]<-"myvalue" for renaming, but make
> sure you don't need the column for reshaping afterwards.

In the next version of reshape, cast will default (with a message) to
using the last column of the data.frame if value and (all) columns are
not available.  This was a nice suggestion from Antony Unwin.

Hadley

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