[R] Transfer a 3-dimensional array to a matrix in R

[Chunyu Dong]

thank you very much! Both the two methods work well for my data.


Best wishes,


Chunyu








At 2015-10-20 19:48:18, "William Dunlap" <wdunlap at tibco.com> wrote:
>Or use aperm() (array index permuation):
>  > array(aperm(x, c(2,1,3)), c(6,3))
>       [,1] [,2] [,3]
>  [1,]    1    7   13
>  [2,]    4   10   16
>  [3,]    2    8   14
>  [4,]    5   11   17
>  [5,]    3    9   15
>  [6,]    6   12   18
>
>Bill Dunlap
>TIBCO Software
>wdunlap tibco.com
>
>
>On Tue, Oct 20, 2015 at 11:31 AM, John Laing <john.laing at gmail.com> wrote:
>>> x <- array(1:18, dim=c(3, 2, 3))
>>> x
>> , , 1
>>
>>      [,1] [,2]
>> [1,]    1    4
>> [2,]    2    5
>> [3,]    3    6
>>
>> , , 2
>>
>>      [,1] [,2]
>> [1,]    7   10
>> [2,]    8   11
>> [3,]    9   12
>>
>> , , 3
>>
>>      [,1] [,2]
>> [1,]   13   16
>> [2,]   14   17
>> [3,]   15   18
>>
>>> apply(x, 3, t)
>>      [,1] [,2] [,3]
>> [1,]    1    7   13
>> [2,]    4   10   16
>> [3,]    2    8   14
>> [4,]    5   11   17
>> [5,]    3    9   15
>> [6,]    6   12   18
>>
>>
>> On Tue, Oct 20, 2015 at 12:39 PM, Chunyu Dong <dongchunyu2004 at 163.com>
>> wrote:
>>
>>> Hello!
>>>
>>>
>>> Recently I am trying to transfer a large 3-dimensional array to a matrix.
>>> For example, a array like:
>>> , , 1
>>>      [,1] [,2]
>>> [1,]    1    4
>>> [2,]    2    5
>>> [3,]    3    6
>>> , , 2
>>>      [,1] [,2]
>>> [1,]    7   10
>>> [2,]    8   11
>>> [3,]    9   12
>>> , , 3
>>>      [,1] [,2]
>>> [1,]   13   16
>>> [2,]   14   17
>>> [3,]   15   18
>>>
>>>
>>> I would like to transfer it to a matrix like:
>>> 1        7          13
>>> 4        10        16
>>> 2        8          14
>>> 5        11        17
>>> 3        9          15
>>> 6        12        18
>>>
>>>
>>> Could you tell me how to do it in R ? Thank you very much!
>>>
>>>
>>> Best regards,
>>> Chunyu
>>>
>>>
>>>
>>>
>>>
>>>         [[alternative HTML version deleted]]
>>>
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>>> http://www.R-project.org/posting-guide.html
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>>>
>>
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>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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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