[R] Subsetting Data

From: Abraham Mathew <abmathewks_at_gmail.com>
Date: Thu, 28 Apr 2011 15:13:38 -0400


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

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