[R] trouble with cumsum?

Makram Talih talih at xena.hunter.cuny.edu
Mon May 30 02:17:13 CEST 2005

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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