[R] Code to fetch summary info from vector

Jose Iparraguirre Jose.Iparraguirre at ageuk.org.uk
Tue Jan 15 17:51:52 CET 2013

Hi Ben

I'm not sure whether I understood correctly, but is it something like this?

> sum(ifelse(b==2,1,0))
[1] 4
> sum(ifelse(b==3,1,0))
[1] 4
> sum(ifelse(b>=2,1,0))
[1] 13
> sum(ifelse(b>2,1,0))
[1] 9


José Iparraguirre
Chief Economist
Age UK

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Benjamin Gillespie
Sent: 15 January 2013 16:16
To: r-help at r-project.org
Subject: [R] Code to fetch summary info from vector

Hi all,

Thanks in advance for any help.

I have a vector "b":


Imagine b is river flow throughout time.

I would like some code that will generate the following information:

number of individual 'periods' where b>1 (= 2 in this case)
period 1 length = 5, max = 4
period 2 length = 8, max = 5

I can't figure anything useful out.

Ben Gillespie
Research Postgraduate
School of Geography
University of Leeds
R-help at r-project.org mailing list
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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