R help - Nov 2008 - access (exactly/only) one dimension of a multidimensional table

Dear list,

I have a multi(3)dimensional table, which is printed as two tables:

 > table.a
, ,  = female


       not at all a little medium heavy
   no          53       27      8     6
   yes         30       67     61    66

, ,  = male


       not at all a little medium heavy
   no          31       20     11     5
   yes          5       19     34    25

How can I access (manipulate) only the first table (female)?
I want to calculate the percentages for each gender group, i.e. dividing 
each table/array by the sum of of this table/array. And I want to keep 
the structure you see, because I use it already for plotting the data.

Any suggestions or would I have to stick to the original data?

Thanks in advance,
Stefan

Try this:

prop.table(table.a, margin = 3)



On Wed, Nov 5, 2008 at 8:08 AM, Stefan Uhmann <
stefan.uhmann@mailbox.tu-dresden.de> wrote:
> Dear list,
>
> I have a multi(3)dimensional table, which is printed as two tables:
>
> > table.a
> , ,  = female
>
>
>      not at all a little medium heavy
>  no          53       27      8     6
>  yes         30       67     61    66
>
> , ,  = male
>
>
>      not at all a little medium heavy
>  no          31       20     11     5
>  yes          5       19     34    25
>
> How can I access (manipulate) only the first table (female)?
> I want to calculate the percentages for each gender group, i.e. dividing
> each table/array by the sum of of this table/array. And I want to keep the
> structure you see, because I use it already for plotting the data.
>
> Any suggestions or would I have to stick to the original data?
>
> Thanks in advance,
> Stefan
>
> ______________________________________________
> R-help@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.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

	[[alternative HTML version deleted]]

Thank you very much, Jim and Henrique,

The solution I expected but was unable to figure out myself was Jim's:
table.a[,,1] to access the third dimension.

The solution by Henrique was unexpected, bit more specific but perfect
for my purpose and very elegant.

I will make use of both in the future.

Great, thank you again!
Stefan

Jim Lemon schrieb, Am 05.11.2008 11:53:
> Stefan Uhmann wrote:
>> Dear list,
>>
>> I have a multi(3)dimensional table, which is printed as two tables:
>>
>>> table.a
>> , ,  = female
>>
>>
>>       not at all a little medium heavy
>>   no          53       27      8     6
>>   yes         30       67     61    66
>>
>> , ,  = male
>>
>>
>>       not at all a little medium heavy
>>   no          31       20     11     5
>>   yes          5       19     34    25
>>
>> How can I access (manipulate) only the first table (female)?
>> I want to calculate the percentages for each gender group, i.e. 
>> dividing each table/array by the sum of of this table/array. And I 
>> want to keep the structure you see, because I use it already for 
>> plotting the data.
>>
> Hi Stefan,
> Would something like this work?
> 
> 100*table.a[,,1]/rowSums(table.a[,,1])
> 
> 
> Jim
> 
>