[R] How to count the number of different elements in a column

Jose Iparraguirre Jose.Iparraguirre at ageuk.org.uk
Mon Nov 26 17:44:25 CET 2012


Hi,

Imagine the column is named XX. 

Type:

> nrow(table(banca_impresa$XX))

and you'll get how many different categories there are in that column.

(If you type 
> table(banca_impresa$XX)
you'll get the frequencies).

José


José Iparraguirre
Chief Economist
Age UK

T 020 303 31482
E Jose.Iparraguirre at ageuk.org.uk


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Hard Core
Sent: 26 November 2012 10:20
To: r-help at r-project.org
Subject: [R] How to count the number of different elements in a column

Hello,
Suppose that i have a dataframe
a <- read.dta("banca_impresa.dta")

i have a column with 17900 obs like 

1
2
3
1
6
7
8
3
4
4

and i want to know the number of the different values so in this case it
would be 7 
How can i do? 
Thank you



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