I know this is a very elementary question... I could not find a solution
looking at old posts.
I am unable to access a variable outside the scope of a for loop, even when
the variable was defined before the loop:
haar <- function() {
a = c(1.4560773, 2.3752412, 0.9798882, 3.0909252, 2.3986487, 1.8581543)
for (i in c(1:100)) {
m = matrix(rnorm(36)+1i*rnorm(36),6)
qrm = qr(m)
Q = qr.Q(qrm)
eival = eigen(Q, only.values=T)
ph = Arg(eival$values)
v = Mod(ph)
a = cat(a,v)
}
hist(a)
}
The hist command does not plot because a is null there.
How do I plot a? I tried using
assign("a", a, envir = .GlobalEnv)
but that does not help either... Neither did using <<-
Any help is most welcome.
Ravi
--
View this message in context:
http://r.789695.n4.nabble.com/Scope-of-variable-tp3381485p3381485.html
Sent from the R help mailing list archive at Nabble.com.
?cat
cat prints text, and returns an invisible NULL. Also, it is general
practice to assign values using '<-' even inside of functions, for
reasons
detailed in ?"<-"
--------------------------------------
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Technician - USGS Leetown Science Center
11649 Leetown Road
Kearneysville WV, 25430
(304) 724-4480
"Is the room still a room when its empty? Does the room,
the thing itself have purpose? Or do we, what's the word... imbue it."
- Jubal Early, Firefly
r-help-bounces at r-project.org wrote on 03/16/2011 07:41:36 AM:
> [image removed]
>
> [R] Scope of variable?
>
> Ravi Kulkarni
>
> to:
>
> r-help
>
> 03/16/2011 09:07 AM
>
> Sent by:
>
> r-help-bounces at r-project.org
>
> I know this is a very elementary question... I could not find a solution
> looking at old posts.
> I am unable to access a variable outside the scope of a for loop, even
when> the variable was defined before the loop:
>
> haar <- function() {
> a = c(1.4560773, 2.3752412, 0.9798882, 3.0909252, 2.3986487, 1.8581543)
>
> for (i in c(1:100)) {
> m = matrix(rnorm(36)+1i*rnorm(36),6)
> qrm = qr(m)
> Q = qr.Q(qrm)
> eival = eigen(Q, only.values=T)
> ph = Arg(eival$values)
> v = Mod(ph)
> a = cat(a,v)
> }
> hist(a)
> }
>
> The hist command does not plot because a is null there.
> How do I plot a? I tried using
>
> assign("a", a, envir = .GlobalEnv)
>
> but that does not help either... Neither did using <<-
> Any help is most welcome.
> Ravi
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Scope-
> of-variable-tp3381485p3381485.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at 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.
Hi,
Not sure what you are trying to do with the "cat" command, but cat
returns an invisible NULL (as described in the doc), so
a = cat(a,v)
just sets a to NULL
Martyn
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Ravi Kulkarni
Sent: 16 March 2011 11:42
To: r-help at r-project.org
Subject: [R] Scope of variable?
I know this is a very elementary question... I could not find a solution
looking at old posts.
I am unable to access a variable outside the scope of a for loop, even
when
the variable was defined before the loop:
haar <- function() {
a = c(1.4560773, 2.3752412, 0.9798882, 3.0909252, 2.3986487, 1.8581543)
for (i in c(1:100)) {
m = matrix(rnorm(36)+1i*rnorm(36),6)
qrm = qr(m)
Q = qr.Q(qrm)
eival = eigen(Q, only.values=T)
ph = Arg(eival$values)
v = Mod(ph)
a = cat(a,v)
}
hist(a)
}
The hist command does not plot because a is null there.
How do I plot a? I tried using
assign("a", a, envir = .GlobalEnv)
but that does not help either... Neither did using <<-
Any help is most welcome.
Ravi
--
View this message in context:
http://r.789695.n4.nabble.com/Scope-of-variable-tp3381485p3381485.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
________________________________________________________________________
This e-mail has been scanned for all viruses by Star.\ _...{{dropped:12}}
I think you meant: a <- c(a, v) and not a <- cat(a, v) On Wed, Mar 16, 2011 at 7:41 AM, Ravi Kulkarni <ravi.kulk at gmail.com> wrote:> I know this is a very elementary question... I could not find a solution > looking at old posts. > I am unable to access a variable outside the scope of a for loop, even when > the variable was defined before the loop: > > haar <- function() { > a = c(1.4560773, 2.3752412, 0.9798882, 3.0909252, 2.3986487, 1.8581543) > > for (i in c(1:100)) { > ? ? ? ?m = matrix(rnorm(36)+1i*rnorm(36),6) > ? ? ? ?qrm = qr(m) > ? ? ? ?Q = qr.Q(qrm) > ? ? ? ?eival = eigen(Q, only.values=T) > ? ? ? ?ph = Arg(eival$values) > ? ? ? ?v = Mod(ph) > ? ? ? ?a = cat(a,v) > } > hist(a) > } > > The hist command does not plot because a is null there. > How do I plot a? I tried using > > ? ? ? ? ? ? ? ? ? ? ? ? ?assign("a", a, envir = .GlobalEnv) > > but that does not help either... Neither did using <<- > Any help is most welcome. > ?Ravi > > -- > View this message in context: http://r.789695.n4.nabble.com/Scope-of-variable-tp3381485p3381485.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at 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. >-- Jim Holtman Data Munger Guru What is the problem that you are trying to solve?