[R] How to group a count

[Deepayan Sarkar]

On 5/15/07, Spilak,Jacqueline [Edm] <Jacqueline.Spilak at ec.gc.ca> wrote:
> Hello R users
> I have a dataset that has different types of records with different
> dates and times pertaining to each.  I would like to have a bar graph of
> a count of the types(ie. The number of types) of recods by hour grouped
> by year.  So the count of the types would be the y axis, the hour on the
> x axis and then grouped by year for easy comparison.  I think that I
> have to use barchart however I don't know how to get barchart to do a
> count and not graph values.

I think you want to use table or xtabs to get a frequency table, and
use barchart on the result. Hard to say more without an example.

-Deepayan