How do I generate a list with a specified increment step?

Question

How do I generate a vector with a specified increment step (e.g. 2)? For example, how do I produce the following

0  2  4  6  8  10 

Answer 1

Executing seq(1, 10, 1) does what 1:10 does. You can change the last parameter of seq, i.e. by, to be the step of whatever size you like.

> #a vector of even numbers > seq(0, 10, by=2) # Explicitly specifying "by" only to increase readability  > [1]  0  2  4  6  8 10 

Answer 2

You can use scalar multiplication to modify each element in your vector.

> r <- 0:10  > r <- r * 2 > r   [1]  0  2  4  6  8 10 12 14 16 18 20 

or

> r <- 0:10 * 2  > r   [1]  0  2  4  6  8 10 12 14 16 18 20