[R] subletting an array according to dimnames

[li li]

That works. Thank you!

2017-06-02 8:00 GMT-04:00 Adams, Jean <jvadams at usgs.gov>:

> Have you tried P2["20", "10", "0"] ?
>
> Jean
>
> On Thu, Jun 1, 2017 at 3:10 PM, li li <hannah.hlx at gmail.com> wrote:
>
>> Hi all,
>>   I have a three dimensional array with the corresponding dimension names.
>> I would like to subset the array according to the dimension names. For
>> example,
>> suppose I want to extract the values corresponding to A=20, B=10, C=0.  I
>> know I
>> can do:
>>  P2[dimnames(P2)$A==20, dimnames(P2)$B==10, dimnames(P2)$C==0]
>>
>> But is there a better way for doing this? Thanks for your help!
>>   Hanna
>>
>> > dimnames(P2)
>>
>> $A
>>
>> [1] "20" "25" "30" "35" "40"
>>
>>
>> $B
>>
>> [1] "5"  "10" "15" "20" "25" "30" "35" "40"
>>
>>
>> $C
>>
>> [1] "0"  "5" "10" "15" "20" "25" "30" "35"
>>
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>>
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>>
>

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