RE: [R] trouble with cumsum?

From: luan_sheng <luan_sheng_at_yahoo.com.cn>
Date: Mon 30 May 2005 - 11:26:14 EST


 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@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Makram Talih Sent: Monday, May 30, 2005 8:17 AM
To: r-help@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

[1] FALSE Am I missing something? Should cumsum have such an outcome?

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

Regards,

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@math.hunter.cuny.edu
Tel: 212-772-5308
Fax: 212-772-4858

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html

__________________________________________________

雅虎免费G邮箱-中国第一绝无垃圾邮件骚扰超大邮箱

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Received on Mon May 30 11:35:24 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:32:15 EST