[R] Error with lapply [addirional clarification needed]

[megh]

I need one more clarification here :

Here I did :

fn <- function(i) return(list(i, i^2))
ss = sapply(1:4, fn)

Here the object "ss" should be a matrix object :
is.matrix(ss)

However I feel it lacks some the matrix object properties. For example the
syntax "min(ss[1,])" generates an error :
"Error in min(ss[1, ]) : invalid 'type' (list) of argument".

What should be the way out? Am I missing something ?

Regards,


baptiste auguie-2 wrote:
> 
> Hi,
> 
> you are feeding lapply "i" as an optional argument, which is passed to  
> fn() and causes an error. Just use lapply(1:4, fn), or better yet,  
> sapply,
> 
>  > fn <- function(i) return(i^2)
>  > sapply(1:4, fn)
> [1]  1  4  9 16
> 
> Hope this helps,
> 
> baptiste
> 
> 
> On 20 Nov 2008, at 16:31, megh wrote:
> 
>>
>> I have written following codes, with intention to get a list with  
>> values
>> 1,2,9,16 :
>>
>> fn <- function(i) return(i^2)
>> lapply(1:4, fn, i)
>>
>> However I got following error :
>> Error in FUN(1:4[[1L]], ...) : unused argument(s) (1)
>>
>> Can anyone please tell me what will be the correct code here?
>>
>> Regards,
>>
>>
>> --
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>>
>> ______________________________________________
>> R-help at r-project.org mailing list
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>> PLEASE do read the posting guide
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>> and provide commented, minimal, self-contained, reproducible code.
> 
> _____________________________
> 
> 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
> 
> ______________________________________________
> 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.
> 
> 

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