change every nth element of a vector R-CodePudding

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change every nth element of a vector R

Time：07-21

I have:

ls = 1:14

I change value of every element except the first, last, and every 4th element from counting from the end

I would like:

ls = c(1, 2, "", "", "", 6, "", "", "", 10, "", "", "", 14)

Any suggestions how to achieve this?

CodePudding user response：

Something like this would work:

ls[-c(1, seq(14, 1, -4))] = ""