wrote:
Date sent: Tue, 31 Jan 2006 11:21:20 +0400
From: Jacques VESLOT [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Copies to: R-help@stat.math.ethz.ch
Subject:Re: [R] match() seq()
Thanks Roger, Andy and Dimitris
sorry if it has already been discussed but i can't understand this:
seq(0.1,1,by=0.1)
[1] 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
match(0.1,seq(0.1,1,by=0.1))
[1] 1
match(0.2,seq(0.1,1,by=0.1))
[1] 2
match(0.3,seq(0.1,1,by=0.1))
[1] NA
match(0.4,seq(0.1,1,by=0.1))
[1] 4
R.version
Hope this is clear:
x - seq(0.1, 1, by=0.1)
0.3 == x[3]
[1] FALSE
abs(0.3 - x[3])
[1] 5.551115e-17
Andy
From: Jacques VESLOT
sorry if it has already been discussed but i can't understand this:
seq(0.1,1,by=0.1)
[1] 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
3:19 PM
Subject: [R] match() seq()
sorry if it has already been discussed but i can't understand this:
seq(0.1,1,by=0.1)
[1] 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
match(0.1,seq(0.1,1,by=0.1))
[1] 1
match(0.2,seq(0.1,1,by=0.1))
[1] 2
match(0.3,seq(0.1,1,by=0.1))
[1] NA
match(0.4
On Mon, 30 Jan 2006, Jacques VESLOT wrote:
sorry if it has already been discussed but i can't understand this:
seq(0.1,1,by=0.1)
[1] 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
match(0.1,seq(0.1,1,by=0.1))
[1] 1
match(0.2,seq(0.1,1,by=0.1))
[1] 2
match(0.3,seq(0.1,1,by=0.1))
[1]
Thanks Roger, Andy and Dimitris...
though i am familiar with this behaviour **in some cases**, i couldn't
catch - yesterday evening - why it matched with 0.4, and not with 0.3;
of course these numbers are not integers ! but i believed match() deals
with such equalities.
i will have a look at
