[R] Use variable inside Function for updating the matrix

[Rantony]

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 !. 

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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