Hello Charlie,
Thanks for your valuable help. You are right. So I changed
tau_i=c(100,200,300,400) to tau_i=c(0,100,200,300) because "400" can be defined
by another term.
I appreciate for your time and knowledge.
Best,
JinNational Renewable Energy Lab.Golden CO, 80401(303)
275-4642jinsuk....@nrel.gov
Date: Thu, 25 Mar 2010 07:48:40 -0800
From: ml-node+1690861-886360020-66...@n4.nabble.com
To: realst...@hotmail.com
Subject: Re: how to deal with vector[0]?
Jin wrote:
Hi,
I have a vector with 4 elements, e.g., tau_i=c(100,200,300,400), but
potentially tau_i[0]=0. In a "for" loop,
tau_i=c(100,200,300,400)
m=4
tau_i[0]=0 # <------- ?
P_i=1
for(i in 2:m)
{
P_i = P_i*(tau_i[i-1]-tau_i[i-2])
}
Error in P_i = P_i * (tau_i[k - 1] - tau_i[k - 2]):
replacement has length zero
Unfortunately, I can add this potential element into "tau_i" because it has
been defined initially and used mainly throughout all procedures.
When I calculate
> k=2
> tau_i[k-1]-tau_i[k-2]
umeric(0)
But, it should be "100". Is there anyone can help me solve this problem?
Best,
Jin
NREL, Golden CO
(303) 275-4642
I'm a little confused on exactly what you're trying to achieve here-- vector
indexes in R start at 1, not 0, and so trying to assign any value to tau_i[ 0 ]
is meaningless.
Using tau_i[ 0 ] in a calculation is equivalent to using numeric( 0 ) -- i.e. a
numeric vector of *length* zero, which contains no values at all.
Does this help?
-CçCharlie Sharpsteen
Undergraduate-- Environmental Resources Engineering
Humboldt State University
View message @
http://n4.nabble.com/how-to-deal-with-vector-0-tp1690812p1690861.html
To unsubscribe from how to deal with vector[0]?, click here.
_________________________________________________________________
Hotmail: Trusted email with powerful SPAM protection.
--
View this message in context:
http://n4.nabble.com/how-to-deal-with-vector-0-tp1690812p1690983.html
Sent from the R help mailing list archive at Nabble.com.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
