[R] Grouping by interval

[Jarosław Jasiewicz]

Sonia Mehault pisze:
> Hello,
>
> I have a dataframe of say 20 lines with one line per individual. I want to group these 20 individuals
> by length class (eg. of 5cm) and get the mean value of all the other variables (eg VarA and VarB) for each length class
>
> My dataframe is as follow:
>
> Length <- 10:30
> VarA <- seq(1000,1200,10)
> VarB <- seq(500,700,10)
> Data <- cbind(Length,VarA,VarB)
>
>
> And I want to get something like:
>
>
> Length Class      Mean VarA       Mean VarB
> [10-15[               1020                520
> [15-20[               1070                570
> [20-25[               1120                620
> [25-30]               1175                675
>
>
> Would you have any suggestions how to do that ?
> Many thanks.
>
>
> Sonia.
>
> 	[[alternative HTML version deleted]]
>
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>   
Sonia!


use cut fuction.

Create two wectos with intervals and lables acording documentation. Very 
simple and fast solution.
Jarek