[R] need help reshaping table using aggregate

[Rui Barradas]

Hello, again.

Actually, you don't need to melt the data.frame, you can directly dcast 
'myf' using value.var="count".

Rui Barradas

Em 20-06-2012 20:56, Rui Barradas escreveu:
> Hello,
>
> Try
>
>
> library(reshape2)
>
> mlt <- melt(myf, id=c("site", "bug"), measure="count")
> myf2 <- dcast(mm, site ~ bug)
> myf2[is.na(myf2)] <- 0
> myf2
>
>
> Hope this helps,
>
> Rui Barradas
>
> Em 20-06-2012 19:58, Tim escreveu:
>> I am trying to learn how to reshape my data set.  I am new to R, so
>> please
>> bear with me.  Basically, I have the following data set:
>>
>> site<-c("A","A","B","B")
>> bug<-c("spider","grasshopper","ladybug","stinkbug")
>> count<-c(2,4,6,8)
>> myf <- data.frame(site, bug, count)
>> myf
>>
>>    site         bug count
>> 1    A      spider     2
>> 2    A grasshopper     4
>> 3    B     ladybug     6
>> 4    B    stinkbug     8
>>
>> This means that in site A, I found 2 spiders and 4 grasshopper.  In
>> site B,
>> I found 6 ladybugs and 8 stinkbugs.
>>
>> I would like to change the df to aggregate the site column and make
>> the bugs
>> columns so it arranged like this:
>>
>>    site spider grasshopper ladybug stinkbug
>> 1    A      2           4       0        0
>> 2    B      0           0       6        8
>>
>>
>> --
>> View this message in context:
>> http://r.789695.n4.nabble.com/need-help-reshaping-table-using-aggregate-tp4634014.html
>>
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
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>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> ______________________________________________
> R-help at 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.