[R] table function

Daniel Malter daniel at umd.edu
Mon Aug 24 18:39:24 CEST 2009

Your question is a little vague. Do you just want to know how often z falls
in one the three classes? If so, you could either code an indicator variable
(e.g. z.cat) that expresses the three categories and then do table(z.cat).
Alternatively, you could just do


It's unclear to me whether you want to summarize the other variables (x and
y) for each of the categories of z. If you want to do that, use tapply (see


cuncta stricte discussurus

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Von: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Im
Auftrag von Inchallah Yarab
Gesendet: Monday, August 24, 2009 11:59 AM
An: r-help at r-project.org
Betreff: [R] table function


i want to use the function table to build a table not of frequence (number
of time the vareable is repeated in a list or a data frame!!) but in
function of classes I don t find a clear explnation in  examples of  ?table


x      y        z
1    0       100
5    1       1500
6    1       1200 
2    2       500 
1    1       3500 
5     2     2000 
8     5     4500

i want to do a table summerizing the number of variable where z is in
[0-1000],],[1000-3000], [> 3000]

thank you very much for your help

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