R help - Nov 2012 - 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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length(unique(a))



Hard Core wrote
> 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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http://r.789695.n4.nabble.com/How-to-count-the-number-of-different-elements-in-a-column-tp4650825p4650833.html
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> x <- c(1, 2, 3, 1, 6, 7, 8, 3, 4, 4)
> length(unique(x))
[1] 7

On Mon, Nov 26, 2012 at 5:20 AM, Hard Core <gioxc at hotmail.it>
wrote:
> 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
>
>
--
Sarah Goslee
http://www.functionaldiversity.org

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).

Jos?


Jos? 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



--
View this message in context:
http://r.789695.n4.nabble.com/How-to-count-the-number-of-different-elements-in-a-column-tp4650825.html
Sent from the R help mailing list archive at Nabble.com.

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