On 24.02.2012 16:59, Arnaud Gaboury wrote:
TY Uwe,
So I will have to write a line for each condition? Right?
In fact I was trying to do something with apply in one line, but couldn't
achieve any result. In fact, all my transformation will be multiplying one
object by a specific number according to the value of df$x.
In that case:
mult <- c(AA = 10, BB = 25)
Then:
df$y <- df$y * mult[df$x]
Uwe Ligges
Arnaud Gaboury
A2CT2 Ltd.
-----Original Message-----
From: Uwe Ligges [mailto:lig...@statistik.tu-dortmund.de]
Sent: vendredi 24 février 2012 16:33
To: Arnaud Gaboury
Cc: r-help@r-project.org
Subject: Re: [R] data frame manipulation with condition
On 24.02.2012 16:25, Arnaud Gaboury wrote:
Dear list,
n00b question, but still can't find any easy answer.
Here is a df:
Change
df<-data.frame(cbind(x=c("AA","BB","CC","AA"),y=1:4))
to
df<- data.frame(x = c("AA","BB","CC","AA"), y = 1:4)
to make your object a sensible data.frame.
df
x y
1 AA 1
2 BB 2
3 CC 3
4 AA 4
I want to modify this df this way :
if df$x=="AA" then df$y=df$y*10
df$y[df$x=="AA"]<- df$y[df$x=="AA"] * 25
...
Uwe Ligges
if df$x=="BB" then df$y=df$y*25
and so on with other conditions.
TY for any help.
Trading
A2CT2 Ltd.
Arnaud Gaboury
A2CT2 Ltd.
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