[R] Error in defining function

[Gabor Grothendieck]

The new code you posted has introduced two more bugs yet
again.

Before posting again run your code in the debugger issuing this
command prior to testing fnc:

debug(fnc)

and then single step through the code.  That way you can find
your own bugs.  See ?debug

You can source aggregate.zoo from R-Forge via:
 source("http://r-forge.r-project.org/plugins/scmsvn/viewcvs.php/*checkout*/pkg/R/aggregate.zoo.R?rev=483&root=zoo")

On Mon, Jul 7, 2008 at 3:19 AM, Megh Dal <megh700004 at yahoo.com> wrote:
> "You will have to translate each character string
> to a function separately."
>
> Here I have a modified program :
>
>  library(zoo)
>  Z.index <- as.Date(sample(12450:15500, 3000))
>  Z.data <- matrix(rnorm(300), ncol = 1)
>
>  data1 <- zoo(Z.data, Z.index)
>
>  fnc = function(data1)
>    {
>    selection2 = select.list(c("Mean", "SD"), multiple = T)
>
>     Mean = function(dataa) mean(dataa)
>     SD = function(dataa) sd(dataa)
>
>     my.match.fun <- function(x) match.fun(x) ###
>
>     for (i in length(selection2))
>        {
>         selection2[i] <- my.match.fun(selection2[i]) ###
>        }
>
>    ag = function(z, by, selection2)
>                  {
>                         f = function(f) aggregate(z, by, f)
>                         do.call(cbind, sapply(selection2, f, simplify = F))
>                  }
>
>     return(ag(data1, as.yearqtr, selection2))
>    }
>
>    fnc(data1)
>
> Frustrated !! still error. I also have tried downloading from R-forge. But download page is not working. I then tried directly from R using install.packages. Still there is no improvement.
>
> Regards,
>
>
> --- On Mon, 7/7/08, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
>
>> From: Gabor Grothendieck <ggrothendieck at gmail.com>
>> Subject: Re: [R] Error in defining function
>> To: megh700004 at yahoo.com
>> Cc: r-help at stat.math.ethz.ch
>> Date: Monday, July 7, 2008, 8:44 AM
>> Your program works as is if you choose Mean but you have
>> introduced two new errors:
>>
>> 1. SD is not defined in your program.
>>
>> 2. if multiple choices are taken then it will try to pass a
>> vector to
>> my.match.fun but that calls match.fun which only allows
>> functions
>> to be passed to it.  You will have to translate each
>> character string
>> to a function separately.
>>
>> Try this:
>>
>> funs <- c("Mean", "SD")
>> f <- function(fun) aggregate(data1, as.yearqtr,
>> get(fun))
>> do.call(cbind, sapply(tolower(funs), f, simplify = FALSE))
>>
>>
>> On Sun, Jul 6, 2008 at 10:43 PM, Megh Dal
>> <megh700004 at yahoo.com> wrote:
>> > I made some changes and also incorporated your advice
>> :
>> >
>> >  library(zoo)
>> >  Z.index <- as.Date(sample(12450:15500, 3000))
>> >  Z.data <- matrix(rnorm(300), ncol = 1)
>> >
>> >  data1 <- zoo(Z.data, Z.index)
>> >
>> >  fnc = function(data1)
>> >    {
>> >    selection2 = select.list(c("Mean",
>> "SD"), multiple = T)
>> >
>> >     Mean = function(dataa) mean(dataa)
>> >      my.match.fun <- function(x) match.fun(x) ###
>> >    selection2 <- my.match.fun(selection2) ###
>> >    ag = function(z, by, selection2)
>> >                  {
>> >                         f = function(f) aggregate(z,
>> by, f)
>> >                         do.call(cbind,
>> sapply(selection2, f, simplify = F))
>> >                  }
>> >
>> >     return(aggregate(data1, as.yearqtr, selection2))
>> >    }
>> >
>> >    fnc(data1)
>> >
>> > But still getting same error.
>> >
>> >
>> > --- On Mon, 7/7/08, Gabor Grothendieck
>> <ggrothendieck at gmail.com> wrote:
>> >
>> >> From: Gabor Grothendieck
>> <ggrothendieck at gmail.com>
>> >> Subject: Re: [R] Error in defining function
>> >> To: megh700004 at yahoo.com
>> >> Cc: r-help at stat.math.ethz.ch
>> >> Date: Monday, July 7, 2008, 1:23 AM
>> >> On Sun, Jul 6, 2008 at 3:19 PM, Megh Dal
>> >> <megh700004 at yahoo.com> wrote:
>> >> > Can anyone please tell me why I am getting
>> this error?
>> >> >
>> >> > library(zoo)
>> >> > Z.index <- as.Date(sample(12450:15500,
>> 3000))
>> >> > Z.data <- matrix(rnorm(300), ncol = 1)
>> >> >
>> >> > data1 <- zoo(Z.data, Z.index)
>> >> >
>> >> > fnc = function(data1)
>> >> >    {
>> >> >    selection2 =
>> select.list(c("Mean"),
>> >> multiple = F)
>> >> >
>> >> >     Mean = function(dataa) mean(dataa)
>> >> >
>> >> >     return(aggregate(data1, as.yearqtr,
>> selection2))
>> >> >    }
>> >> >
>> >> >    fnc(data1)
>> >> >
>> >> > I got following error :
>> >> > Error in get(as.character(FUN), mode =
>> >> "function", envir = envir) :
>> >> >  variable "Mean" of mode
>> >> "function" was not found
>> >> >
>> >>
>> >> Its a bug in aggregate.zoo .  Its just been fixed
>> in the
>> >> zoo devel version
>> >> available on R-Forge so you can either grab that
>> or use the
>> >> workaround
>> >> below:
>> >>
>> >> library(zoo)
>> >>
>> >> set.seed(1)
>> >> Z.data <- matrix(rnorm(300), ncol = 1)
>> >> Z.index <- as.Date(sample(12450:15500, 3000))
>> >> data1 <- zoo(Z.data, Z.index)
>> >>
>> >> fnc <- function(data1) {
>> >>    selection2 <- select.list("Mean",
>> multiple
>> >> = FALSE)
>> >>     Mean <- function(dataa) mean(dataa)
>> >>
>> >>     my.match.fun <- function(x) match.fun(x)
>> ###
>> >>     selection2 <- my.match.fun(selection2) ###
>> >>
>> >>     return(aggregate(data1, as.yearqtr,
>> selection2))
>> >> }
>> >>
>> >> fnc(data1)
>> >
>> >
>> >
>> >
>
>
>
>