R help - Dec 2012 - group values in classes

Dear R users,
I want to group numerical values in classes with different size and count
the values for each classes.

My data is in this forma:
 d  15  12,5  30,4  20,5  80,4  100,5  8,2  40,5  33  21  11
And I want the group them in classes with 4 (5,....etc) cm size like this:
 class d  16  16  32  24  84  104  12  44  36  24  12
and final to count values for each class:
class d                               n  12 2  16 2  24 2  32 1  36 1  44 1
84 1  104 1  Total 11

Thank you!
-- 



---
Catalin-Constantin ROIBU
Forestry engineer, PhD
Forestry Faculty of Suceava
Str. Universitatii no. 13, Suceava, 720229, Romania
office phone     +4 0230 52 29 78, ext. 531
mobile phone   +4 0745 53 18 01
                       +4 0766 71 76 58
FAX:                +4 0230 52 16 64
silvic.usv.ro

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Hello,

Try the following.


classes <- function(x, n){
     n*findInterval(x, seq(0, ceiling(max(x)), by = n))
}

c4 <- classes(d, 4)
table(c4)
sum(table(c4))


Happy new year,

Rui Barradas
Em 31-12-2012 10:13, catalin roibu escreveu:
> Dear R users,
> I want to group numerical values in classes with different size and count
> the values for each classes.
>
> My data is in this forma:
>   d  15  12,5  30,4  20,5  80,4  100,5  8,2  40,5  33  21  11
> And I want the group them in classes with 4 (5,....etc) cm size like this:
>   class d  16  16  32  24  84  104  12  44  36  24  12
> and final to count values for each class:
> class d                               n  12 2  16 2  24 2  32 1  36 1  44 1
> 84 1  104 1  Total 11
>
> Thank you!

At Mon, 31 Dec 2012 12:13:43 +0200,
catalin roibu wrote:
> 
> Dear R users,
> I want to group numerical values in classes with different size and count
> the values for each classes.
> 
> My data is in this forma:
>  d  15  12,5  30,4  20,5  80,4  100,5  8,2  40,5  33  21  11
> And I want the group them in classes with 4 (5,....etc) cm size like this:
>  class d  16  16  32  24  84  104  12  44  36  24  12
> and final to count values for each class:
> class d                               n  12 2  16 2  24 2  32 1  36 1  44 1
> 84 1  104 1  Total 11
I rounded the sizes to the nearst whole cm.  It's not clear to me how
you want to group the elements from your description...
> data = c(15,  12.5,  30.4,  20.5,  80.4,  100.5,  8.2,  40.5,  33, 21,  11)
> aggregate(data, list(round(data)), length)
   Group.1 x
1        8 1
2       11 1
3       12 1
4       15 1
5       20 1
6       21 1
7       30 1
8       33 1
9       40 1
10      80 1
11     100 1

aggregate groups each element in the first argument according to the
specified class.  The third element is a function that is called on
each group.

Neal