[R] trouble with cumsum?

luan_sheng luan_sheng at yahoo.com.cn
Mon May 30 03:26:14 CEST 2005

 R help document showed us that you should not use "==" for comparing
objects, and you will use "all.equal".

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Makram Talih
Sent: Monday, May 30, 2005 8:17 AM
To: r-help at stat.math.ethz.ch
Subject: [R] trouble with cumsum?

Dear R users,

I am using R version 2.0.1 (2004/11/15) on an i386-pc-mingw32 platform. I
encounter the following problem while using cumsum:

> a <- rep(0.01, 100)
> b <- cumsum(a)
> sum(a) == 1
[1] TRUE
> b[100] == 1

Am I missing something? Should cumsum have such an outcome?

Thanks in advance for any clarifications any of you can offer.


Makram Talih

Makram Talih, Ph.D.
Assistant Professor
Department of Mathematics and Statistics Hunter College of the City
University of New York
695 Park Avenue, Room 905 HE
New York, NY 10021

Website: http://stat.hunter.cuny.edu/talih
E-mail: talih at math.hunter.cuny.edu
Tel: 212-772-5308
Fax: 212-772-4858

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