[R] apply on a data frame

Laura Holt lauraholt_983 at hotmail.com
Fri Aug 20 18:27:26 CEST 2004

Hi R People:

There are 2 data sets of the iris data: one is iris3, which is a 3-d array, 
and the other is iris, which
is a data frame with 150 rows and 6 variables.

Getting means is straightforward from the 3-day iris3 set:
         Setosa Versicolor Virginica
Sepal L.  5.006      5.936     6.588
Sepal W.  3.428      2.770     2.974
Petal L.  1.462      4.260     5.552
Petal W.  0.246      1.326     2.026

Is there is similar way to obtain those values from the iris data frame, 

thanks in advance
R Version 1.9.1 Windows.

Laura Holt
mailto: lauraholt_983 at hotmail.com

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