R help - Nov 2011 - Nested lapply? Is this allowed?

Dear all,

I want for a given data set to call a funciton many time. That bring us all to
the notion of lapply (or any other variance). My problem is that this data set
should also be created from another lapply

As for example



   DataToAnalyse <- return_selected_time_interval(TimeStamps,Time[[1]],
Time[[2]])  # Where Time[[1]] and Time[[2]] are lists 
        return(lapply(do_analysis(DataToAnalyse)))             


as you can see the DataToAnalyse should be also an lapply. For the list of give
Time (Time[[1]] and Time[[2]]) should create a list DataToAnalyse.

My concern though is that the DataToAnalyse for all the Time is huge so I was
looking for something memory efficient that can do something like that

Create Data To Analyse-->feed it into do_analysis-->store result into a
list(The result is small). Repeat that sentence for all Time

How I can do something like that efficiently in R?

B.R
Alex
	[[alternative HTML version deleted]]

For short:
1. I wonder if you cannot make the two steps one and hence only need one 
lapply anway.
2. Why not just try out?
3. If it does not work, ordinary loops may be able to.

best,
Uwe Ligges



On 01.11.2011 09:24, Alaios wrote:
> Dear all,
>
> I want for a given data set to call a funciton many time. That bring us all
to the notion of lapply (or any other variance). My problem is that this data
set should also be created from another lapply
>
> As for example
>
>
>
>     DataToAnalyse<- return_selected_time_interval(TimeStamps,Time[[1]],
Time[[2]])  # Where Time[[1]] and Time[[2]] are lists
>          return(lapply(do_analysis(DataToAnalyse)))
>
>
> as you can see the DataToAnalyse should be also an lapply. For the list of
give Time (Time[[1]] and Time[[2]]) should create a list DataToAnalyse.
>
> My concern though is that the DataToAnalyse for all the Time is huge so I
was looking for something memory efficient that can do something like that
>
> Create Data To Analyse-->feed it into do_analysis-->store result into
a list(The result is small). Repeat that sentence for all Time
>
> How I can do something like that efficiently in R?
>
> B.R
> Alex
> 	[[alternative HTML version deleted]]
>
>
>
>
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