[R] trying ti use a function in aggregate
arun
smartpink111 at yahoo.com
Thu Oct 25 18:04:23 CEST 2012
Hi,
May be this helps:
dat1<-read.table(text="
Trip_id Vessel CommonName Length Count
1 230 Sunlight ShadAmerican 19 1
2 230 Sunlight ShadAmerican 20 1
3 230 Sunlight ShadAmerican 21 1
4 230 Sunlight ShadAmerican 23 1
5 230 Sunlight ShadAmerican 26 1
6 230 Sunlight ShadAmerican 27 1
7 230 Sunlight ShadAmerican 30 2
8 230 Sunlight ShadAmerican 33 1
9 230 Sunlight ShadAmerican 34 1
10 230 Sunlight ShadAmerican 37 1
11 230 Sunlight HerringBlueback 20 1
12 230 Sunlight HerringBlueback 21 2
13 230 Sunlight HerringBlueback 22 5
14 230 Sunlight HerringBlueback 26 1
15 230 Sunlight Alewife 17 1
16 230 Sunlight Alewife 18 1
17 230 Sunlight Alewife 20 2
18 230 Sunlight Alewife 21 4
19 230 Sunlight Alewife 22 16
20 230 Sunlight Alewife 23 22
21 230 Sunlight Alewife 24 16
22 230 Sunlight Alewife 25 4
23 230 Sunlight Alewife 26 1
24 230 Sunlight Alewife 27 2
25 230 Sunlight Alewife 28 2
26 231 Western_Venture ShadAmerican 23 1
27 231 Western_Venture ShadAmerican 24 1
28 231 Western_Venture ShadAmerican 25 1
29 231 Western_Venture ShadAmerican 28 2
30 231 Western_Venture ShadAmerican 29 2
",sep="",header=TRUE,stringsAsFactors=FALSE)
with(dat1,aggregate(Count,by=list(Trip_id=Trip_id,Species=CommonName),function(x) x/sum(x)))
Trip_id Species
1 230 Alewife
2 230 HerringBlueback
3 230 ShadAmerican
4 231 ShadAmerican
x
#1 0.01408451, 0.01408451, 0.02816901, 0.05633803, 0.22535211, 0.30985915, 0.22535211, 0.05633803, 0.01408451, 0.02816901, 0.02816901
#2 0.1111111, 0.2222222, 0.5555556, 0.1111111
#3 0.09090909, 0.09090909, 0.09090909, 0.09090909, 0.09090909, 0.09090909, 0.18181818, 0.09090909, 0.09090909, 0.09090909
#4 0.1428571, 0.1428571, 0.1428571, 0.2857143, 0.2857143
#or
library(plyr)
res<-ddply(dat1,.(Trip_id=Trip_id,Vessel=Vessel,CommonName=CommonName), summarize, Count/sum(Count))
colnames(res)[4]<-"value"
head(res)
# Trip_id Vessel CommonName value
#1 230 Sunlight Alewife 0.01408451
#2 230 Sunlight Alewife 0.01408451
#3 230 Sunlight Alewife 0.02816901
#4 230 Sunlight Alewife 0.05633803
#5 230 Sunlight Alewife 0.22535211
#6 230 Sunlight Alewife 0.30985915
A.K.
----- Original Message -----
From: Sally_roman <sroman at umassd.edu>
To: r-help at r-project.org
Cc:
Sent: Thursday, October 25, 2012 10:19 AM
Subject: [R] trying ti use a function in aggregate
Hi -I am using R v 2.13.0. I am trying to use the aggregate function to
calculate the percent at length for each Trip_id and CommonName. Here is a
small subset of the data.
Trip_id Vessel CommonName Length Count
1 230 Sunlight Shad,American 19 1
2 230 Sunlight Shad,American 20 1
3 230 Sunlight Shad,American 21 1
4 230 Sunlight Shad,American 23 1
5 230 Sunlight Shad,American 26 1
6 230 Sunlight Shad,American 27 1
7 230 Sunlight Shad,American 30 2
8 230 Sunlight Shad,American 33 1
9 230 Sunlight Shad,American 34 1
10 230 Sunlight Shad,American 37 1
11 230 Sunlight Herring,Blueback 20 1
12 230 Sunlight Herring,Blueback 21 2
13 230 Sunlight Herring,Blueback 22 5
14 230 Sunlight Herring,Blueback 26 1
15 230 Sunlight Alewife 17 1
16 230 Sunlight Alewife 18 1
17 230 Sunlight Alewife 20 2
18 230 Sunlight Alewife 21 4
19 230 Sunlight Alewife 22 16
20 230 Sunlight Alewife 23 22
21 230 Sunlight Alewife 24 16
22 230 Sunlight Alewife 25 4
23 230 Sunlight Alewife 26 1
24 230 Sunlight Alewife 27 2
25 230 Sunlight Alewife 28 2
26 231 Western Venture Shad,American 23 1
27 231 Western Venture Shad,American 24 1
28 231 Western Venture Shad,American 25 1
29 231 Western Venture Shad,American 28 2
30 231 Western Venture Shad,American 29 2
My code is:
myfun<-function (x) x/sum(x)
b<-with(data,aggregate(x=list(Percent=Count),by=list(Trip_id=Trip_id,Length=Length,Species=CommonName),
FUN="myfun"))
My issue is that the percent is not be calculated by Trip_id and CommonName.
The result is that each row has a percent of 1 indicating that myfun is not
dividing by the sum of counts with a Trip_id/CommonName group. Any help
would be appreciated.
Thank you
--
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