I have created a data frame named z.
a = c(1,1,1);
b = c(2,2,2);
c = c(3,3,3);
d = c(4,4,4);
z = data.frame(a,b,c,d);
I want to remove column c and d from data frame z.
I tried this code
p = subset(z , colnames(z) == c('a' , 'b'))
But i am getting this result
a b c d
1 2 3 4
1 2 3 4
What changes should i make in this command to remove column c and d from z.