Re: [R] Error with lapply [addirional clarification needed]

From: megh <megh700004_at_yahoo.com>
Date: Sat, 22 Nov 2008 01:54:45 -0800 (PST)

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,
>>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Error-with-lapply-tp20605066p20605066.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> 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.

>
> _____________________________
>
> Baptiste AuguiƩ
>
> 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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Received on Sat 22 Nov 2008 - 09:57:24 GMT

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