[R] How to group a count

From: Spilak,Jacqueline [Edm] <Jacqueline.Spilak_at_EC.gc.ca>
Date: Tue, 15 May 2007 15:10:47 -0600

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.

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