[R] R: mean from list

[Kjetil Brinchmann Halvorsen]

statistical.model at googlemail.com wrote:
> great!! thanks very much, mean(unlist(lapply(listdata, function(z) z$c)))

WHY unlist(lapply(...   when sapply(...
is simpler?

Kjetil


> works well.
> and what about getting the average table $a (displaying the average elements
> across all 1000 matrix)? could you please help me? I am struggling with
> this...
> 
> thanks in advance
> Roberto
> 
> 
> 
> mean(unlist(lapply(x, function(z) z$d))) should do the trick
> 
> On Sun, 12 Feb 2006 20:06:12 +0000, statistical.model at googlemail.com wrote:
> 
>> hi all,
>> I have a simple problem that i am not able to solve. I've a list called
>> datalist with the following structure:
>>
>> [...]
>>
>> [[10]]
>> [[10]]$a
>>
>>      -1  0  1
>>   -1 31  5  2
>>   0   6  7  5
>>   1   1  7 36
>>
>> [[10]]$b
>>
>>      -1  0  1
>>   -1 31  5  2
>>   0   6  7  5
>>   1   1  7 36
>>
>> [[10]]$c
>> [1] 0.855
>>
>> [[10]]$d
>> [1] 0.855
>>
>> [...]
>>
>> with [[1]] ... [[100]]. How can i get the mean value of datalist[[x]]$d,
>> where x represents all elements from 1 to 1000 ?
>>
>> thanks in advance!!!!
>>
>> Roberto Furlan
>> University of Turin
>>
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> 
> Rajarshi Guha
> <rxg218 at psu.edu>
> <http://jijo.cjb.net>
> 
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