Re: [R] return named list from foreach
You cannot do that in one step. Do it right after:
names(out) - df$nm
Please don't post using HTML format.. it scrambles code, and since we cannot
see what you saw it doesn't help in any way.
Also note that df is a function in the base stats package... not a good name
to use.
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On February 20, 2015 7:44:41 AM PST, Alexander Shenkin ashen...@ufl.edu wrote:
Hello all,
I've been trying to figure out how to return a named list from foreach.
Given that the order of the returned list is guaranteed to be in the
order in which the object is passed to foreach, list members can be
named afterwards. However, I'm wondering if there's a better way to do
it, perhaps with some sort of combine function?
library(doParallel)
library(foreach)
cl - makeCluster(4)
registerDoParallel(cl)
df = data.frame(nm = letters[11:20], a = 1:10, b=11:20)
out = foreach(i=1:nrow(df)) %dopar% {
a = list(j = sqrt(df[i,]$a), k = sqrt(df[i,]$b))
a
}
How do I name the elements of out using the corresponding values
df$nm?
thanks,
allie
[[alternative HTML version deleted]]
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[R] return named list from foreach
Hello all,
I've been trying to figure out how to return a named list from foreach.
Given that the order of the returned list is guaranteed to be in the
order in which the object is passed to foreach, list members can be
named afterwards. However, I'm wondering if there's a better way to do
it, perhaps with some sort of combine function?
library(doParallel)
library(foreach)
cl - makeCluster(4)
registerDoParallel(cl)
df = data.frame(nm = letters[11:20], a = 1:10, b=11:20)
out = foreach(i=1:nrow(df)) %dopar% {
a = list(j = sqrt(df[i,]$a), k = sqrt(df[i,]$b))
a
}
How do I name the elements of out using the corresponding values df$nm?
thanks,
allie
[[alternative HTML version deleted]]
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Re: [R] Return invisible list
-Original Message-
[mailto:r-help-boun...@r-project.org] On Behalf Of francisco.ahued
Subject: [R] Return invisible list
x=read.table(data.txt,header=T)
goa=(x[,3])
meplot(goa)
I can see the plot, but I would like to see the values of the
x and y axis.
Something returned as invisible is returned but not printed.
You just need to catch it in a suitable variable. That's what you do with any
other function where you want to keep the value:
x=read.table(data.txt,header=T)
goa=(x[,3])
mplist - meplot(goa) #assigns the output to a variable called mplist
mplist #calls the default print method for that object.
If you don't need to keep the values for re-use, putting something in
parentheses evaluates the expression and returns the result, effectively
removing the invisibility cloak without explicit assignment.
Example
z-rnorm(100)
hist( z ) #returns invisible list
but
( hist( z ) ) #additionally displays the output.
S Ellison***
This email and any attachments are confidential. Any use...{{dropped:8}}
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[R] Return invisible list
Hi, I'm new to R. I'm trying to do some extreme value theory analysis, looking at the Mean Excess Plot of a series. These are the commands I type to get the plot: x=read.table(data.txt,header=T) goa=(x[,3]) meplot(goa) I can see the plot, but I would like to see the values of the x and y axis. According to this page (http://rss.acs.unt.edu/Rdoc/library/VGAM/html/meplot.html), A list is returned invisibly with the following components. threshold The x axis values. meanExcess The y axis values. Each value is a sample mean minus a value u. So my question is, how can I see (or even export) threshold and meanExcess? Thanks, F -- View this message in context: http://r.789695.n4.nabble.com/Return-invisible-list-tp3652323p3652323.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Return invisible list
On Jul 7, 2011, at 3:00 PM, francisco.ahued wrote: Hi, I'm new to R. I'm trying to do some extreme value theory analysis, looking at the Mean Excess Plot of a series. These are the commands I type to get the plot: x=read.table(data.txt,header=T) goa=(x[,3]) meplot(goa) I can see the plot, but I would like to see the values of the x and y axis. According to this page (http://rss.acs.unt.edu/Rdoc/library/VGAM/html/meplot.html), A list is returned invisibly with the following components. If a function returns something invisibly, it means that you need to assign the result to a named object, which can then be inspected. threshold The x axis values. meanExcess The y axis values. Each value is a sample mean minus a value u. So my question is, how can I see (or even export) threshold and meanExcess? -- David Winsemius, MD West Hartford, CT __ 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.
Re: [R] Return invisible list
Thanks! How do I do that? -- View this message in context: http://r.789695.n4.nabble.com/Return-invisible-list-tp3652323p3652396.html Sent from the R help mailing list archive at Nabble.com. __ 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.
Re: [R] Return invisible list
On Jul 7, 2011, at 3:41 PM, savage.arrow wrote: Adding back context from earlier posting (WHICH IS YOUR DUTY savage.arrow) -- x=read.table(data.txt,header=T) goa=(x[,3]) meplot(goa) I can see the plot, but I would like to see the values of the x and y axis. According to this page (http://rss.acs.unt.edu/Rdoc/library/VGAM/html/meplot.html), A list is returned invisibly with the following components. So my question is, how can I see (or even export) threshold and meanExcess? --- Thanks! How do I do that? ?- # And this also means you need to pick up your copy of Introoduction to R and read the Posting Guide where the request to include context is made and the justification for the request is offered. -- View this message in context: http://r.789695.n4.nabble.com/Return-invisible-list-tp3652323p3652396.html Sent from the R help mailing list archive at Nabble.com. __ 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. David Winsemius, MD West Hartford, CT __ 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.
[R] Return a list
Dear R Users,
another problem for me is the output of a function.
I have several output variables which I give back with the list command.
test - function{return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the output
variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing them all
down?
thank you very much for your help!
Stefan Fritsch
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Re: [R] Return a list
?attach
or ?with
Hope this helps,
baptiste
On 26 Sep 2008, at 14:57, Stefan Fritsch wrote:
Dear R Users,
another problem for me is the output of a function.
I have several output variables which I give back with the list
command.
test - function {return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to
the output variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without
writing them all down?
thank you very much for your help!
Stefan Fritsch
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Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
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Re: [R] Return a list
Try this:
sapply(names(result), function(nm)assign(nm, result[[nm]], envir = globalenv()))
On Fri, Sep 26, 2008 at 10:57 AM, Stefan Fritsch
[EMAIL PROTECTED] wrote:
Dear R Users,
another problem for me is the output of a function.
I have several output variables which I give back with the list command.
test - function{return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the output
variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing them
all down?
thank you very much for your help!
Stefan Fritsch
__
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40 S 49° 16' 22 O
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Re: [R] Return a list
Stefan Fritsch [EMAIL PROTECTED] wrote:
I have several output variables which I give back with the list command.
test - function {return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the output
variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing them
all down?
thank you very much for your help!
I don't have a good answer for your question, but I do encourage
you to choose a method that will be readily intelligible to you
when you revisit your code X years later.
--
Mike Prager, NOAA, Beaufort, NC
* Opinions expressed are personal and not represented otherwise.
* Any use of tradenames does not constitute a NOAA endorsement.
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Re: [R] Return a list
Mike Prager wrote:
Stefan Fritsch [EMAIL PROTECTED] wrote:
I have several output variables which I give back with the list command.
test - function {return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the output
variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing them
all down?
arguably ugly and risky, but simple:
for (name in names(result)) assign(name, result[[name]])
(note, for this to work you actually need to name the components of the
returned list: return(list(a=a,b=b,...)))
vQ
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Re: [R] Return a list
But why do this? Just leave the (preferably named) variables as list
components and work with them there.
1. ?comment tells you how to add a comment attribute to the list for self
documentation (what were the components? how are they related? etc.)
2. ?with shows you how to access the components of the list individually in
the usual way.
3. ?lapply and friends shows you how to loop over list components .
etc.
Cheers,
Bert
Bert Gunter
Genentech
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Wacek Kusnierczyk
Sent: Friday, September 26, 2008 12:40 PM
To: Mike Prager
Cc: R help
Subject: Re: [R] Return a list
Mike Prager wrote:
Stefan Fritsch [EMAIL PROTECTED] wrote:
I have several output variables which I give back with the list command.
test - function {return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the
output variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing
them all down?
arguably ugly and risky, but simple:
for (name in names(result)) assign(name, result[[name]])
(note, for this to work you actually need to name the components of the
returned list: return(list(a=a,b=b,...)))
vQ
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Re: [R] Return a list
The answers that were previously given allow you to easily extract results
from your returned list, but if I understand well, this list is created only
because you cannot return several arguments whereas you need to keep the
values of a, b, c, etc. Am I right?
Another solution would be to directly send the values you want to keep
into the environment where they are needed. The following example supposes
you need to keep a only in the upper environment from which your function
was launched, and b in another one (e.g. .GlobalEnv).
Hope this may help.
Nael
# Here is a function such as yours:
test - function(){
+ a - 1
+ b - 2
+ return(list(a=a, b=b, c=c))
+ }
result - test()
(a - result$a)
[1] 1
(b - result$b)
[1] 2
rm(a, b)
# Now our variables will be automatically assigned into the chosen
environment
test2 - function(){
+ a - 1
+ b - 2
+ assign(a, a, envir=parent.frame(n=1))
+ assign(b, b, envir=.GlobalEnv)
+ return(NULL)
+ }
# Suppose test2 is launched by another function
test2.launcher - function() {
+ test2()
+ print(paste(a exists inside test2.launcher:, exists(a)))
+ print(paste(b exists inside test2.launcher:, exists(b)))
+ return (NULL)
+ }
test2.launcher()
[1] a exists inside test2.launcher: TRUE
[1] b exists inside test2.launcher: TRUE
NULL
exists(a)# a still exists in the upper environment
[1] FALSE
exists(b)# b does not
[1] TRUE
On Fri, Sep 26, 2008 at 9:39 PM, Wacek Kusnierczyk
[EMAIL PROTECTED] wrote:
Mike Prager wrote:
Stefan Fritsch [EMAIL PROTECTED] wrote:
I have several output variables which I give back with the list command.
test - function {return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the
output variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing
them all down?
arguably ugly and risky, but simple:
for (name in names(result)) assign(name, result[[name]])
(note, for this to work you actually need to name the components of the
returned list: return(list(a=a,b=b,...)))
vQ
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[[alternative HTML version deleted]]
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Re: [R] Return a list
Bert Gunter wrote:
But why do this? Just leave the (preferably named) variables as list
components and work with them there.
1. ?comment tells you how to add a comment attribute to the list for self
documentation (what were the components? how are they related? etc.)
2. ?with shows you how to access the components of the list individually in
the usual way.
3. ?lapply and friends shows you how to loop over list components .
etc.
Cheers,
Bert
Bert Gunter
Genentech
it depends on what the original author wanted.
with constructs a new environment, and all assignments, if any, made in
the expression evaluated within with are invisible to the outside
(unless one plays with environments, again):
x = 1:10
a = 3
with(test(), { x[1:3] = c(a,b,c); x = x+d; a = a + 1 })
x # still 1:10, whatever test returns
a # still 3. whatever test returns
if the author wanted the values included in the list to be visible and
accessible by simple names, and used in assignments in a larger part of
code, using with might be inconvenient.
it does not mean that my solution below is a good one, it's just a quick
fix. i wouldn't do that in myself, it's badly non-functional ;)
vQ
I have several output variables which I give back with the list command.
test - function{return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the
output variables.
result - test()
a - result$a
b - result$b
c - result$c
d - result$d
...
is there a more elegant way to assign these variables, without writing
them all down?
arguably ugly and risky, but simple:
for (name in names(result)) assign(name, result[[name]])
(note, for this to work you actually need to name the components of the
returned list: return(list(a=a,b=b,...)))
vQ
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Email: [EMAIL PROTECTED]
Phone: +47 73591875, +47 72574609
Department of Computer and Information Science (IDI)
Faculty of Information Technology, Mathematics and Electrical Engineering (IME)
Norwegian University of Science and Technology (NTNU)
Sem Saelands vei 7, 7491 Trondheim, Norway
Room itv303
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Faculty of Medicine (DMF)
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Laboratory Center, Erling Skjalgsons gt. 1, 7030 Trondheim, Norway
Room 231.05.060
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Re: [R] Return a list
it depends on what the original author wanted.
with constructs a new environment, and all assignments, if any, made in
the expression evaluated within with are invisible to the outside
(unless one plays with environments, again):
x = 1:10
a = 3
with(test(), { x[1:3] = c(a,b,c); x = x+d; a = a + 1 })
x # still 1:10, whatever test returns
a # still 3. whatever test returns
if the author wanted the values included in the list to be visible and
accessible by simple names, and used in assignments in a larger part of
code, using with might be inconvenient.
What about within ?
Hadley
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