[R] rbind - names in dataframe. Beginner Question

[Gerrit Eichner]

Hello, Sarah,

take a look at the online help page of the function cut() (and apply the 
function to the Hunger-column).

  Hth  --  Gerrit

On Thu, 29 Oct 2015, Dagmar wrote:

> Dear Sarah, (dear All),
> Thank you for trying to help! You are right, that I want to add a column to 
> my dataframe with a corresponding value to the Hunger column.
> Your solution is basically correct in the result but my data are a little 
> more complicated. Maybe that example describes it better:
>
> myframe <- data.frame (ID=c("Ernie", "Ernie", "Ernie", "Bert",
> "Bert","Bert", "Duck"), Hunger=c(1.2,1.3,1.1,2.1,2.2,1.4,3.3) )
> myframe
>
> # Now I want to add a column which says "hunger" for values between 1.0 - 2;
> #"big Hunger" for >2 $ <=3, "very big Hunger" for >3
> # so that the result looks somewhat like that:
> myframeresult <- data.frame (ID=c("Ernie", "Ernie", "Ernie", "Bert",
> "Bert","Bert", "Duck"), Hunger=c(1.2,1.3,1.1,2.1,2.2,1.4,3.3),Hungertype 
> =c("Hunger", "Hunger", "Hunger", "bigHunger", "bigHunger", 
> "Hunger","verybigHunger" ) )
> myframeresult
>
> Does anyone know the solution?
> Thanks in advance for trying,
> Dagmar
>
>
> Am 28.10.2015 um 20:54 schrieb Sarah Goslee:
>> If I'm reading this correctly, you want to add a column to your
>> dataframe with a name corresponding to the value in the Hunger column.
>> 
>> myframe <- data.frame (ID=c("Ernie", "Ernie", "Ernie", "Bert",
>> "Bert","Bert", "Duck"), Hunger=c(1,1,1,2,2,1,3) )
>> 
>> myframe$Hungertype <- c("none", "bighunger", 
>> "verybighunger")[myframe$Hunger]
>>
>>       ID Hunger    Hungertype
>> 1 Ernie      1          none
>> 2 Ernie      1          none
>> 3 Ernie      1          none
>> 4  Bert      2     bighunger
>> 5  Bert      2     bighunger
>> 6  Bert      1          none
>> 7  Duck      3 verybighunger
>> 
>> Then you can subset it to remove low values, sort it, etc.
>> 
>> On Wed, Oct 28, 2015 at 8:20 AM, Dagmar Cimiotti <dagmar.cimiotti at gmx.de> 
>> wrote:
>>> Hello,
>>> It must be very easy.
>>> 
>>> I have data like this:
>>> myframe <- data.frame (ID=c("Ernie", "Ernie", "Ernie", "Bert",
>>> "Bert","Bert", "Duck"), Hunger=c(1,1,1,2,2,1,3) )
>>> myframe
>>> bighunger <- subset (myframe, myframe$Hunger>=2 &myframe$Hunger <3 )
>>> bighunger
>>> verybighunger <- subset(myframe,myframe$Hunger>=3)
>>> verybighunger
>>> hungry <- rbind (bighunger=bighunger,very=verybighunger)
>>> hungry
>>> 
>>> BUT I want a result like this:
>>> myframesresult <- data.frame(Hunger=c("bighunger","bighunger","very"),
>>> ID=c("Bert", "Bert", "duck"), Hunger=c(2,2,3))
>>> myframesresult
>>> 
>>> Where is my mistake?
>>> Very many thanks in advance!!
>>> Dagmar
>
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