[R] cast in reshape and reshape2

Kaiyin Zhong kindlychung at gmail.com
Fri Dec 23 20:58:00 CET 2011


> library(reshape2)
> x = melt(airquality, id=c('month', 'day'))

With reshape I can cast with multiple functions:

> library(reshape)
> cast(x, month+variable~., c(mean,sd))
   month variable       mean         sd
1      5    ozone  23.615385  22.224449
2      5  solar.r 181.296296 115.075499
3      5     wind  11.622581   3.531450
4      5     temp  65.548387   6.854870
5      6    ozone  29.444444  18.207904
6      6  solar.r 190.166667  92.882975
7      6     wind  10.266667   3.769234
8      6     temp  79.100000   6.598589
9      7    ozone  59.115385  31.635837
10     7  solar.r 216.483871  80.568344
11     7     wind   8.941935   3.035981
12     7     temp  83.903226   4.315513
13     8    ozone  59.961538  39.681210
14     8  solar.r 171.857143  76.834943
15     8     wind   8.793548   3.225930
16     8     temp  83.967742   6.585256
17     9    ozone  31.448276  24.141822
18     9  solar.r 167.433333  79.118280
19     9     wind  10.180000   3.461254
20     9     temp  76.900000   8.355671

Is there a way to do the same job with reshape2?
-- 
Kaiyin Zhong
------------------------------------------------------------------------------------------------------------------
Neuroscience Research Institute, Peking University, Beijing, P.R.China 100038



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