[R] Use variable inside Function for updating the matrix

[Uwe Ligges]

On 29.05.2012 09:17, Rantony wrote:
> Hi,
>
> Here i have a data frame like this,
> frame name is "dat"
> *NAME          AGE       ELIGIBLE*
> A                     20
> B                     14
> C                     35
> D                     10
> E                      50
>
> In this, i want to change the column '*ELIGIBLE*' status to '*YES*' If, AGE
> between 18 to 35
> Which means that, i should get a put like this...
> *NAME          AGE       ELIGIBLE*
> A                     20          YES
> B                     14
> C                     35           YES
> D                     10
> E                      50
> ----------------------------------------------
> Now i got the solution for this,
> dat[dat$AGE<=35&  da$AGE>18,"ELIGIBLE"]<-YES
>
> My issue is, i assigned AGE to a variable and that variable i tried inside
> the function.
> for eg:-
> *Obj_Name*<- AGE
> dat[dat$*Obj_Name*<=35&  da$*Obj_Name*>18,"ELIGIBLE"]<-YES
> Now, what is i getting the error !.


You need

dat[[Obj_Name]]  rather than dat$Obj_Name, the latter means the same as
dat[["Obj_Name"]] and hence is wrong.

Uwe Ligges




> So,could you please help me, what is the solution *pass column name through
> *variable to this function ?
>
> Can i get immediate solution please ?
>
> - Thanks
> Antony
>
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