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Christofer Bogaso

2018-Mar-04 17:21 UTC

[R] Change Function based on ifelse() condtion

Below is my full implementation (tried to make it simple as for demonstration)

Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...) {
if (Apply_MC) {
return(mclapply(X, FUN, ...))
} else {
if (any(names(list(...)) == 'mc.cores')) {
myList = list(...)[!names(list(...)) %in% 'mc.cores']
}
return(lapply(X, FUN, myList))
}
}


Lapply_me(as.list(1:4), function(xx) {
if (xx == 1) return('a')
if (xx == 2) return('b')
if (xx == 3) return('c')
if (xx == 4) return('d')
}, Apply_MC = FALSE, mc.cores = 2)

Error message :

Error in FUN(X[[i]], ...) : unused argument (list())

Kindly note that, with Apply_MC = TRUE, it is working perfectly.

On Sun, Mar 4, 2018 at 10:45 PM, Eric Berger <ericjberger at gmail.com>
wrote:> That's fine. The issue is how you called Lapply_me(). What did you pass
as
> the argument to FUN?
> And if you did not pass anything that how is FUN declared?
> You have not shown that in your email.
>
>
>
>
> On Sun, Mar 4, 2018 at 7:11 PM, Christofer Bogaso
> <bogaso.christofer at gmail.com> wrote:
>>
>> My modified function looks below :
>>
>> Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...) {
>> if (Apply_MC) {
>> return(mclapply(X, FUN, ...))
>> } else {
>> if (any(names(list(...)) == 'mc.cores')) {
>> myList = list(...)[!names(list(...)) %in% 'mc.cores']
>> }
>> return(lapply(X, FUN, myList))
>> }
>> }
>>
>> Here, I am not passing ... anymore rather passing myList
>>
>> On Sun, Mar 4, 2018 at 10:37 PM, Eric Berger <ericjberger at
gmail.com>
>> wrote:
>> > Hi Christofer,
>> > Before you made the change that I suggested, your program was
stopping
>> > at
>> > the statement: list(...) = list(..) .etc
>> > This means that it never tried to execute the statement:
>> > return(lapply(X,FUN,...))
>> > Now that you have made the change, it gets past the first
statement and
>> > tries to execute the statement: return(lapply(X,FUN,...)).
>> > That attempt is generating the error message because whatever you
are
>> > passing in as the FUN argument is not expecting extra arguments.
>> >
>> > HTH,
>> > Eric
>> >
>> >
>> > On Sun, Mar 4, 2018 at 6:52 PM, Christofer Bogaso
>> > <bogaso.christofer at gmail.com> wrote:
>> >>
>> >> @Eric - with this approach I am getting below error :
>> >>
>> >> Error in FUN(X[[i]], ...) : unused argument (list())
>> >>
>> >> On Sun, Mar 4, 2018 at 10:18 PM, Eric Berger <ericjberger
at gmail.com>
>> >> wrote:
>> >> > Hi Christofer,
>> >> > You cannot assign to list(...). You can do the following
>> >> >
>> >> > myList <- list(...)[!names(list(...)) %in%
'mc.cores']
>> >> >
>> >> > HTH,
>> >> > Eric
>> >> >
>> >> > On Sun, Mar 4, 2018 at 6:38 PM, Christofer Bogaso
>> >> > <bogaso.christofer at gmail.com> wrote:
>> >> >>
>> >> >> Hi,
>> >> >>
>> >> >> As an example, I want to create below kind of custom
Function which
>> >> >> either be mclapply pr lapply
>> >> >>
>> >> >> Lapply_me = function(X = X, FUN = FUN, ..., Apply_MC
= FALSE) {
>> >> >> if (Apply_MC) {
>> >> >> return(mclapply(X, FUN, ...))
>> >> >> } else {
>> >> >> if (any(names(list(...)) == 'mc.cores')) {
>> >> >> list(...) = list(...)[!names(list(...)) %in%
'mc.cores']
>> >> >> }
>> >> >> return(lapply(X, FUN, ...))
>> >> >> }
>> >> >> }
>> >> >>
>> >> >> However when Apply_MC = FALSE it generates below
error saying :
>> >> >>
>> >> >>   '...' used in an incorrect context
>> >> >>
>> >> >>
>> >> >> Appreciate if you can help me with the correct
approach. Thanks,
>> >> >>
>> >> >>
>> >> >> On Sun, Mar 4, 2018 at 9:34 PM, Duncan Murdoch
>> >> >> <murdoch.duncan at gmail.com>
>> >> >> wrote:
>> >> >> > On 04/03/2018 10:39 AM, Christofer Bogaso wrote:
>> >> >> >>
>> >> >> >> Hi again,
>> >> >> >>
>> >> >> >> I am looking for some way to alternately use
2 related functions,
>> >> >> >> based on some ifelse() condition.
>> >> >> >>
>> >> >> >> For example, I have 2 functions mclapply()
and lapply()
>> >> >> >>
>> >> >> >> However, mclapply() function has one extra
parameter 'mc.cores'
>> >> >> >> which
>> >> >> >> lapply doesnt not have.
>> >> >> >>
>> >> >> >> I know when mc.cores = 1, these 2 functions
are essentially same,
>> >> >> >> however I am looking for more general way to
control them within
>> >> >> >> ifelse() constion
>> >> >> >>
>> >> >> >> Can someone please help me how can I use
them within ifelse()
>> >> >> >> condition.
>> >> >> >
>> >> >> >
>> >> >> > Don't.  ifelse() usually evaluates *both*
the true and false
>> >> >> > values,
>> >> >> > and
>> >> >> > then selects entries from each.  Just use an if
statement.
>> >> >> >
>> >> >> > Duncan Murdoch
>> >> >>
>> >> >> ______________________________________________
>> >> >> R-help at r-project.org mailing list -- To
UNSUBSCRIBE and more, see
>> >> >> 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.
>> >> >
>> >> >
>> >
>> >
>
>

Eric Berger

2018-Mar-04 17:58 UTC

head link

[R] Change Function based on ifelse() condtion

The reason that it works for Apply_MC=TRUE is that in that case you call
mclapply(X,FUN,...) and
the mclapply() function strips off the mc.cores argument from the
"..."
list before calling FUN, so FUN is being called with zero arguments,
exactly as it is declared.

A quick workaround is to change the line

Lapply_me(as.list(1:4), function(xx) {

to

Lapply_me(as.list(1:4), function(xx,dummyList) {

HTH,
Eric


On Sun, Mar 4, 2018 at 7:21 PM, Christofer Bogaso <
bogaso.christofer at gmail.com> wrote:
> Below is my full implementation (tried to make it simple as for
> demonstration)
>
> Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...) {
> if (Apply_MC) {
> return(mclapply(X, FUN, ...))
> } else {
> if (any(names(list(...)) == 'mc.cores')) {
> myList = list(...)[!names(list(...)) %in% 'mc.cores']
> }
> return(lapply(X, FUN, myList))
> }
> }
>
>
> Lapply_me(as.list(1:4), function(xx) {
> if (xx == 1) return('a')
> if (xx == 2) return('b')
> if (xx == 3) return('c')
> if (xx == 4) return('d')
> }, Apply_MC = FALSE, mc.cores = 2)
>
> Error message :
>
> Error in FUN(X[[i]], ...) : unused argument (list())
>
> Kindly note that, with Apply_MC = TRUE, it is working perfectly.
>
> On Sun, Mar 4, 2018 at 10:45 PM, Eric Berger <ericjberger at
gmail.com>
> wrote:
> > That's fine. The issue is how you called Lapply_me(). What did you
pass
> as
> > the argument to FUN?
> > And if you did not pass anything that how is FUN declared?
> > You have not shown that in your email.
> >
> >
> >
> >
> > On Sun, Mar 4, 2018 at 7:11 PM, Christofer Bogaso
> > <bogaso.christofer at gmail.com> wrote:
> >>
> >> My modified function looks below :
> >>
> >> Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...) {
> >> if (Apply_MC) {
> >> return(mclapply(X, FUN, ...))
> >> } else {
> >> if (any(names(list(...)) == 'mc.cores')) {
> >> myList = list(...)[!names(list(...)) %in% 'mc.cores']
> >> }
> >> return(lapply(X, FUN, myList))
> >> }
> >> }
> >>
> >> Here, I am not passing ... anymore rather passing myList
> >>
> >> On Sun, Mar 4, 2018 at 10:37 PM, Eric Berger <ericjberger at
gmail.com>
> >> wrote:
> >> > Hi Christofer,
> >> > Before you made the change that I suggested, your program was
stopping
> >> > at
> >> > the statement: list(...) = list(..) .etc
> >> > This means that it never tried to execute the statement:
> >> > return(lapply(X,FUN,...))
> >> > Now that you have made the change, it gets past the first
statement
> and
> >> > tries to execute the statement: return(lapply(X,FUN,...)).
> >> > That attempt is generating the error message because whatever
you are
> >> > passing in as the FUN argument is not expecting extra
arguments.
> >> >
> >> > HTH,
> >> > Eric
> >> >
> >> >
> >> > On Sun, Mar 4, 2018 at 6:52 PM, Christofer Bogaso
> >> > <bogaso.christofer at gmail.com> wrote:
> >> >>
> >> >> @Eric - with this approach I am getting below error :
> >> >>
> >> >> Error in FUN(X[[i]], ...) : unused argument (list())
> >> >>
> >> >> On Sun, Mar 4, 2018 at 10:18 PM, Eric Berger
<ericjberger at gmail.com>
> >> >> wrote:
> >> >> > Hi Christofer,
> >> >> > You cannot assign to list(...). You can do the
following
> >> >> >
> >> >> > myList <- list(...)[!names(list(...)) %in%
'mc.cores']
> >> >> >
> >> >> > HTH,
> >> >> > Eric
> >> >> >
> >> >> > On Sun, Mar 4, 2018 at 6:38 PM, Christofer Bogaso
> >> >> > <bogaso.christofer at gmail.com> wrote:
> >> >> >>
> >> >> >> Hi,
> >> >> >>
> >> >> >> As an example, I want to create below kind of
custom Function
> which
> >> >> >> either be mclapply pr lapply
> >> >> >>
> >> >> >> Lapply_me = function(X = X, FUN = FUN, ...,
Apply_MC = FALSE) {
> >> >> >> if (Apply_MC) {
> >> >> >> return(mclapply(X, FUN, ...))
> >> >> >> } else {
> >> >> >> if (any(names(list(...)) == 'mc.cores'))
{
> >> >> >> list(...) = list(...)[!names(list(...)) %in%
'mc.cores']
> >> >> >> }
> >> >> >> return(lapply(X, FUN, ...))
> >> >> >> }
> >> >> >> }
> >> >> >>
> >> >> >> However when Apply_MC = FALSE it generates below
error saying :
> >> >> >>
> >> >> >>   '...' used in an incorrect context
> >> >> >>
> >> >> >>
> >> >> >> Appreciate if you can help me with the correct
approach. Thanks,
> >> >> >>
> >> >> >>
> >> >> >> On Sun, Mar 4, 2018 at 9:34 PM, Duncan Murdoch
> >> >> >> <murdoch.duncan at gmail.com>
> >> >> >> wrote:
> >> >> >> > On 04/03/2018 10:39 AM, Christofer Bogaso
wrote:
> >> >> >> >>
> >> >> >> >> Hi again,
> >> >> >> >>
> >> >> >> >> I am looking for some way to
alternately use 2 related
> functions,
> >> >> >> >> based on some ifelse() condition.
> >> >> >> >>
> >> >> >> >> For example, I have 2 functions
mclapply() and lapply()
> >> >> >> >>
> >> >> >> >> However, mclapply() function has one
extra parameter 'mc.cores'
> >> >> >> >> which
> >> >> >> >> lapply doesnt not have.
> >> >> >> >>
> >> >> >> >> I know when mc.cores = 1, these 2
functions are essentially
> same,
> >> >> >> >> however I am looking for more general
way to control them
> within
> >> >> >> >> ifelse() constion
> >> >> >> >>
> >> >> >> >> Can someone please help me how can I
use them within ifelse()
> >> >> >> >> condition.
> >> >> >> >
> >> >> >> >
> >> >> >> > Don't.  ifelse() usually evaluates
*both* the true and false
> >> >> >> > values,
> >> >> >> > and
> >> >> >> > then selects entries from each.  Just use
an if statement.
> >> >> >> >
> >> >> >> > Duncan Murdoch
> >> >> >>
> >> >> >> ______________________________________________
> >> >> >> R-help at r-project.org mailing list -- To
UNSUBSCRIBE and more, see
> >> >> >> 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.
> >> >> >
> >> >> >
> >> >
> >> >
> >
> >
>
	[[alternative HTML version deleted]]

Christofer Bogaso

2018-Mar-04 18:18 UTC

head link

[R] Change Function based on ifelse() condtion

Thanks Eric, this is working.

On Sun, Mar 4, 2018 at 11:28 PM, Eric Berger <ericjberger at gmail.com>
wrote:> The reason that it works for Apply_MC=TRUE is that in that case you call
> mclapply(X,FUN,...) and
> the mclapply() function strips off the mc.cores argument from the
"..." list
> before calling FUN, so FUN is being called with zero arguments, exactly as
> it is declared.
>
> A quick workaround is to change the line
>
> Lapply_me(as.list(1:4), function(xx) {
>
> to
>
> Lapply_me(as.list(1:4), function(xx,dummyList) {
>
> HTH,
> Eric
>
>
> On Sun, Mar 4, 2018 at 7:21 PM, Christofer Bogaso
> <bogaso.christofer at gmail.com> wrote:
>>
>> Below is my full implementation (tried to make it simple as for
>> demonstration)
>>
>> Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...) {
>> if (Apply_MC) {
>> return(mclapply(X, FUN, ...))
>> } else {
>> if (any(names(list(...)) == 'mc.cores')) {
>> myList = list(...)[!names(list(...)) %in% 'mc.cores']
>> }
>> return(lapply(X, FUN, myList))
>> }
>> }
>>
>>
>> Lapply_me(as.list(1:4), function(xx) {
>> if (xx == 1) return('a')
>> if (xx == 2) return('b')
>> if (xx == 3) return('c')
>> if (xx == 4) return('d')
>> }, Apply_MC = FALSE, mc.cores = 2)
>>
>> Error message :
>>
>> Error in FUN(X[[i]], ...) : unused argument (list())
>>
>> Kindly note that, with Apply_MC = TRUE, it is working perfectly.
>>
>> On Sun, Mar 4, 2018 at 10:45 PM, Eric Berger <ericjberger at
gmail.com>
>> wrote:
>> > That's fine. The issue is how you called Lapply_me(). What did
you pass
>> > as
>> > the argument to FUN?
>> > And if you did not pass anything that how is FUN declared?
>> > You have not shown that in your email.
>> >
>> >
>> >
>> >
>> > On Sun, Mar 4, 2018 at 7:11 PM, Christofer Bogaso
>> > <bogaso.christofer at gmail.com> wrote:
>> >>
>> >> My modified function looks below :
>> >>
>> >> Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...)
{
>> >> if (Apply_MC) {
>> >> return(mclapply(X, FUN, ...))
>> >> } else {
>> >> if (any(names(list(...)) == 'mc.cores')) {
>> >> myList = list(...)[!names(list(...)) %in% 'mc.cores']
>> >> }
>> >> return(lapply(X, FUN, myList))
>> >> }
>> >> }
>> >>
>> >> Here, I am not passing ... anymore rather passing myList
>> >>
>> >> On Sun, Mar 4, 2018 at 10:37 PM, Eric Berger <ericjberger
at gmail.com>
>> >> wrote:
>> >> > Hi Christofer,
>> >> > Before you made the change that I suggested, your program
was
>> >> > stopping
>> >> > at
>> >> > the statement: list(...) = list(..) .etc
>> >> > This means that it never tried to execute the statement:
>> >> > return(lapply(X,FUN,...))
>> >> > Now that you have made the change, it gets past the first
statement
>> >> > and
>> >> > tries to execute the statement:
return(lapply(X,FUN,...)).
>> >> > That attempt is generating the error message because
whatever you are
>> >> > passing in as the FUN argument is not expecting extra
arguments.
>> >> >
>> >> > HTH,
>> >> > Eric
>> >> >
>> >> >
>> >> > On Sun, Mar 4, 2018 at 6:52 PM, Christofer Bogaso
>> >> > <bogaso.christofer at gmail.com> wrote:
>> >> >>
>> >> >> @Eric - with this approach I am getting below error :
>> >> >>
>> >> >> Error in FUN(X[[i]], ...) : unused argument (list())
>> >> >>
>> >> >> On Sun, Mar 4, 2018 at 10:18 PM, Eric Berger
<ericjberger at gmail.com>
>> >> >> wrote:
>> >> >> > Hi Christofer,
>> >> >> > You cannot assign to list(...). You can do the
following
>> >> >> >
>> >> >> > myList <- list(...)[!names(list(...)) %in%
'mc.cores']
>> >> >> >
>> >> >> > HTH,
>> >> >> > Eric
>> >> >> >
>> >> >> > On Sun, Mar 4, 2018 at 6:38 PM, Christofer
Bogaso
>> >> >> > <bogaso.christofer at gmail.com> wrote:
>> >> >> >>
>> >> >> >> Hi,
>> >> >> >>
>> >> >> >> As an example, I want to create below kind
of custom Function
>> >> >> >> which
>> >> >> >> either be mclapply pr lapply
>> >> >> >>
>> >> >> >> Lapply_me = function(X = X, FUN = FUN, ...,
Apply_MC = FALSE) {
>> >> >> >> if (Apply_MC) {
>> >> >> >> return(mclapply(X, FUN, ...))
>> >> >> >> } else {
>> >> >> >> if (any(names(list(...)) ==
'mc.cores')) {
>> >> >> >> list(...) = list(...)[!names(list(...)) %in%
'mc.cores']
>> >> >> >> }
>> >> >> >> return(lapply(X, FUN, ...))
>> >> >> >> }
>> >> >> >> }
>> >> >> >>
>> >> >> >> However when Apply_MC = FALSE it generates
below error saying :
>> >> >> >>
>> >> >> >>   '...' used in an incorrect context
>> >> >> >>
>> >> >> >>
>> >> >> >> Appreciate if you can help me with the
correct approach. Thanks,
>> >> >> >>
>> >> >> >>
>> >> >> >> On Sun, Mar 4, 2018 at 9:34 PM, Duncan
Murdoch
>> >> >> >> <murdoch.duncan at gmail.com>
>> >> >> >> wrote:
>> >> >> >> > On 04/03/2018 10:39 AM, Christofer
Bogaso wrote:
>> >> >> >> >>
>> >> >> >> >> Hi again,
>> >> >> >> >>
>> >> >> >> >> I am looking for some way to
alternately use 2 related
>> >> >> >> >> functions,
>> >> >> >> >> based on some ifelse() condition.
>> >> >> >> >>
>> >> >> >> >> For example, I have 2 functions
mclapply() and lapply()
>> >> >> >> >>
>> >> >> >> >> However, mclapply() function has
one extra parameter
>> >> >> >> >> 'mc.cores'
>> >> >> >> >> which
>> >> >> >> >> lapply doesnt not have.
>> >> >> >> >>
>> >> >> >> >> I know when mc.cores = 1, these 2
functions are essentially
>> >> >> >> >> same,
>> >> >> >> >> however I am looking for more
general way to control them
>> >> >> >> >> within
>> >> >> >> >> ifelse() constion
>> >> >> >> >>
>> >> >> >> >> Can someone please help me how can
I use them within ifelse()
>> >> >> >> >> condition.
>> >> >> >> >
>> >> >> >> >
>> >> >> >> > Don't.  ifelse() usually evaluates
*both* the true and false
>> >> >> >> > values,
>> >> >> >> > and
>> >> >> >> > then selects entries from each.  Just
use an if statement.
>> >> >> >> >
>> >> >> >> > Duncan Murdoch
>> >> >> >>
>> >> >> >>
______________________________________________
>> >> >> >> R-help at r-project.org mailing list -- To
UNSUBSCRIBE and more, see
>> >> >> >> 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.
>> >> >> >
>> >> >> >
>> >> >
>> >> >
>> >
>> >
>
>

Bert Gunter

2018-Mar-04 18:21 UTC

head link

[R] Change Function based on ifelse() condtion

... and note also:
> f <- function(...)list(...) <- list(...)  ## you cannot have
list(...) onLHS
> f(x=1,y="a")Error in list(...) <- list(...) : '...' used in an incorrect context


In addition to Eric's suggestions, maybe something like this construction
is useful:

Lapply_me = function(X = X, FUN = FUN, ..., Apply_MC = FALSE) {
   if (Apply_MC) {
      return(mclapply(X, FUN, ...))
   } else {
      if (any(names(list(...)) == 'mc.cores')) {
         l = list(...)[!names(list(...)) %in% 'mc.cores']
      }
      return(do.call(lapply,c(list(X,FUN),l)))
   }
}
> Lapply_me (X=1:5,FUN=sum,mc.cores=4)[[1]]
[1] 1

[[2]]
[1] 2

[[3]]
[1] 3

[[4]]
[1] 4

[[5]]
[1] 5

Though the program logic needs fixing: if none of the names in list(...)
are "mc.cores," l is undefined!

Cheers,
Bert



Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Sun, Mar 4, 2018 at 9:58 AM, Eric Berger <ericjberger at gmail.com>
wrote:
> The reason that it works for Apply_MC=TRUE is that in that case you call
> mclapply(X,FUN,...) and
> the mclapply() function strips off the mc.cores argument from the
"..."
> list before calling FUN, so FUN is being called with zero arguments,
> exactly as it is declared.
>
> A quick workaround is to change the line
>
> Lapply_me(as.list(1:4), function(xx) {
>
> to
>
> Lapply_me(as.list(1:4), function(xx,dummyList) {
>
> HTH,
> Eric
>
>
> On Sun, Mar 4, 2018 at 7:21 PM, Christofer Bogaso <
> bogaso.christofer at gmail.com> wrote:
>
> > Below is my full implementation (tried to make it simple as for
> > demonstration)
> >
> > Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...) {
> > if (Apply_MC) {
> > return(mclapply(X, FUN, ...))
> > } else {
> > if (any(names(list(...)) == 'mc.cores')) {
> > myList = list(...)[!names(list(...)) %in% 'mc.cores']
> > }
> > return(lapply(X, FUN, myList))
> > }
> > }
> >
> >
> > Lapply_me(as.list(1:4), function(xx) {
> > if (xx == 1) return('a')
> > if (xx == 2) return('b')
> > if (xx == 3) return('c')
> > if (xx == 4) return('d')
> > }, Apply_MC = FALSE, mc.cores = 2)
> >
> > Error message :
> >
> > Error in FUN(X[[i]], ...) : unused argument (list())
> >
> > Kindly note that, with Apply_MC = TRUE, it is working perfectly.
> >
> > On Sun, Mar 4, 2018 at 10:45 PM, Eric Berger <ericjberger at
gmail.com>
> > wrote:
> > > That's fine. The issue is how you called Lapply_me(). What
did you pass
> > as
> > > the argument to FUN?
> > > And if you did not pass anything that how is FUN declared?
> > > You have not shown that in your email.
> > >
> > >
> > >
> > >
> > > On Sun, Mar 4, 2018 at 7:11 PM, Christofer Bogaso
> > > <bogaso.christofer at gmail.com> wrote:
> > >>
> > >> My modified function looks below :
> > >>
> > >> Lapply_me = function(X = X, FUN = FUN, Apply_MC = FALSE, ...)
{
> > >> if (Apply_MC) {
> > >> return(mclapply(X, FUN, ...))
> > >> } else {
> > >> if (any(names(list(...)) == 'mc.cores')) {
> > >> myList = list(...)[!names(list(...)) %in% 'mc.cores']
> > >> }
> > >> return(lapply(X, FUN, myList))
> > >> }
> > >> }
> > >>
> > >> Here, I am not passing ... anymore rather passing myList
> > >>
> > >> On Sun, Mar 4, 2018 at 10:37 PM, Eric Berger <ericjberger
at gmail.com>
> > >> wrote:
> > >> > Hi Christofer,
> > >> > Before you made the change that I suggested, your
program was
> stopping
> > >> > at
> > >> > the statement: list(...) = list(..) .etc
> > >> > This means that it never tried to execute the statement:
> > >> > return(lapply(X,FUN,...))
> > >> > Now that you have made the change, it gets past the
first statement
> > and
> > >> > tries to execute the statement:
return(lapply(X,FUN,...)).
> > >> > That attempt is generating the error message because
whatever you
> are
> > >> > passing in as the FUN argument is not expecting extra
arguments.
> > >> >
> > >> > HTH,
> > >> > Eric
> > >> >
> > >> >
> > >> > On Sun, Mar 4, 2018 at 6:52 PM, Christofer Bogaso
> > >> > <bogaso.christofer at gmail.com> wrote:
> > >> >>
> > >> >> @Eric - with this approach I am getting below error
:
> > >> >>
> > >> >> Error in FUN(X[[i]], ...) : unused argument (list())
> > >> >>
> > >> >> On Sun, Mar 4, 2018 at 10:18 PM, Eric Berger <
> ericjberger at gmail.com>
> > >> >> wrote:
> > >> >> > Hi Christofer,
> > >> >> > You cannot assign to list(...). You can do the
following
> > >> >> >
> > >> >> > myList <- list(...)[!names(list(...)) %in%
'mc.cores']
> > >> >> >
> > >> >> > HTH,
> > >> >> > Eric
> > >> >> >
> > >> >> > On Sun, Mar 4, 2018 at 6:38 PM, Christofer
Bogaso
> > >> >> > <bogaso.christofer at gmail.com> wrote:
> > >> >> >>
> > >> >> >> Hi,
> > >> >> >>
> > >> >> >> As an example, I want to create below kind
of custom Function
> > which
> > >> >> >> either be mclapply pr lapply
> > >> >> >>
> > >> >> >> Lapply_me = function(X = X, FUN = FUN, ...,
Apply_MC = FALSE) {
> > >> >> >> if (Apply_MC) {
> > >> >> >> return(mclapply(X, FUN, ...))
> > >> >> >> } else {
> > >> >> >> if (any(names(list(...)) ==
'mc.cores')) {
> > >> >> >> list(...) = list(...)[!names(list(...))
%in% 'mc.cores']
> > >> >> >> }
> > >> >> >> return(lapply(X, FUN, ...))
> > >> >> >> }
> > >> >> >> }
> > >> >> >>
> > >> >> >> However when Apply_MC = FALSE it generates
below error saying :
> > >> >> >>
> > >> >> >>   '...' used in an incorrect
context
> > >> >> >>
> > >> >> >>
> > >> >> >> Appreciate if you can help me with the
correct approach. Thanks,
> > >> >> >>
> > >> >> >>
> > >> >> >> On Sun, Mar 4, 2018 at 9:34 PM, Duncan
Murdoch
> > >> >> >> <murdoch.duncan at gmail.com>
> > >> >> >> wrote:
> > >> >> >> > On 04/03/2018 10:39 AM, Christofer
Bogaso wrote:
> > >> >> >> >>
> > >> >> >> >> Hi again,
> > >> >> >> >>
> > >> >> >> >> I am looking for some way to
alternately use 2 related
> > functions,
> > >> >> >> >> based on some ifelse() condition.
> > >> >> >> >>
> > >> >> >> >> For example, I have 2 functions
mclapply() and lapply()
> > >> >> >> >>
> > >> >> >> >> However, mclapply() function has
one extra parameter
> 'mc.cores'
> > >> >> >> >> which
> > >> >> >> >> lapply doesnt not have.
> > >> >> >> >>
> > >> >> >> >> I know when mc.cores = 1, these 2
functions are essentially
> > same,
> > >> >> >> >> however I am looking for more
general way to control them
> > within
> > >> >> >> >> ifelse() constion
> > >> >> >> >>
> > >> >> >> >> Can someone please help me how can
I use them within ifelse()
> > >> >> >> >> condition.
> > >> >> >> >
> > >> >> >> >
> > >> >> >> > Don't.  ifelse() usually evaluates
*both* the true and false
> > >> >> >> > values,
> > >> >> >> > and
> > >> >> >> > then selects entries from each.  Just
use an if statement.
> > >> >> >> >
> > >> >> >> > Duncan Murdoch
> > >> >> >>
> > >> >> >>
______________________________________________
> > >> >> >> R-help at r-project.org mailing list -- To
UNSUBSCRIBE and more,
> see
> > >> >> >>
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.
> > >> >> >
> > >> >> >
> > >> >
> > >> >
> > >
> > >
> >
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>
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