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##### Question
How to discard alternate numbers from an array and resize the length of an array using R?

R Lists-and-its-Operations 02-03 min 20-30 sec 12-10-19, 12:22 p.m. gthaldankar

Let's say you have an array A as follows -

A<-c(1,2,3,4,5,6)

Suppose you want to keep only the elements at the odd places then you may create a sequence as follows -

seq(1, length(A), 2)

The sequence will start from 1 to the length of array A by skipping one element or taking the alternate element only.

Now to keep only the elements at the odd places then use the following command -

A <- A[seq(1, length(A), 2)]

For even elements start the sequence from '2' instead of '1' as follows -

A <- A[seq(2, length(A), 2)]
12-10-19, 12:40 p.m. chrl3hr5@gmail.com

We can do its simply by removing those indices. Here is an example,
a=c(1:20)
b=seq(1,length(a),by=2)
a[-b]
12-10-19, 12:43 p.m. Savy
Let say array A = 1,2,3,4,5,6,7 and I want to discard the element 1,2,4. How to discard the same and resize the array?
12-10-19, 12:59 p.m. gthaldankar
So, here we want to remove indices 1, 2, 4. You may use B= A[-c(1,2,4)] , then B is resized array.
12-10-19, 1:06 p.m. Savy