R help - Apr 2011 - Subsetting Data

I'm using the subset() function in R.

dat <- data.frame(one=c(6,7,8,9,10), Number=c(5,15,13,1,13))

subset(dat, Number >= 10)

However, I want to find the number of all rows who meet the Number>=10
condition.

I've done this in the past with something like colSums or rowSums or another
similar function.
But I don't remember how to get the number of elements which meet that
condition.

function(subset(dat, Number >= 10))   #function is what i'm asking about

In the above example, I'd run get 3 because there are 3 Number values
greater than 10.

> sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: i686-pc-linux-gnu (32-bit)


Help,
Abraham

	[[alternative HTML version deleted]]

Try this:

sum(dat$Number >= 10)

On Thu, Apr 28, 2011 at 3:13 PM, Abraham Mathew <abmathewks at gmail.com>
wrote:
> I'm using the subset() function in R.
>
> dat <- data.frame(one=c(6,7,8,9,10), Number=c(5,15,13,1,13))
>
> subset(dat, Number >= 10)
>
> However, I want to find the number of all rows who meet the Number>=10
> condition.
>
> I've done this in the past with something like colSums or rowSums or
another
> similar function.
> But I don't remember how to get the number of elements which meet that
> condition.
>
> function(subset(dat, Number >= 10)) ? #function is what i'm asking
about
>
> In the above example, I'd run get 3 because there are 3 Number values
> greater than 10.
>
>
>> sessionInfo()
> R version 2.13.0 (2011-04-13)
> Platform: i686-pc-linux-gnu (32-bit)
>
>
> Help,
> Abraham
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
==============================================Jon Daily
Technician
==============================================#!/usr/bin/env outside
# It's great, trust me.

On Apr 28, 2011, at 3:13 PM, Abraham Mathew wrote:
> I'm using the subset() function in R.
>
> dat <- data.frame(one=c(6,7,8,9,10), Number=c(5,15,13,1,13))
>
> subset(dat, Number >= 10)
>
> However, I want to find the number of all rows who meet the Number>=10
> condition.
>
> I've done this in the past with something like colSums or rowSums or  
> another
> similar function.
> But I don't remember how to get the number of elements which meet that
> condition.
>
> function(subset(dat, Number >= 10))   #function is what i'm asking  
> about
Daily's answer would work but if you wanted a direct answer to your  
question then try nrow or NROW:

 > nrow(subset(dat, Number >= 10))
[1] 3

 > NROW(subset(dat, Number >= 10))
[1] 3

There is a difference and I am under the impression that NROW is safer  
in some way.

>
> In the above example, I'd run get 3 because there are 3 Number values
> greater than 10.

-- 
David Winsemius, MD
West Hartford, CT