Make a list of the letters at even-numbered position in Alphabet.

Questions
1

Hello,

To make a list of the letters at even-numbered position in Alphabet, I wrote these codes:

Select[Alphabet[], EvenQ[Flatten[Position[Alphabet[], #]]] &]

But it can’t solve. May you tell me where I did wrong?

Thanks

2

Here’s one approach:

Alphabet[][[2 ;; ;; 2]]

That’s using Part, with starting position 2, no end position, and step size of 2.

3

[2 ;; ;; 2]

Thanks for your reply. May you tell me where can I learn this syntax. I can’t understand it.

4

Here are some other options:

Partition[Alphabet[], 2][[All, 2]]

SequenceSplit[Alphabet[], {_, b_} :> b]

Downsample[Alphabet[], 2, 2]
5

You can read about the Part syntax here: Part: Get a specified piece of an expression—Wolfram Documentation

Summary:

someList[[2]] (*gives the second element of a list*)

someList[[2;;10]] (*gives elements 2 through 10*)

someList[[2 ;;]] (*gives elements 2 through the end of the list*)

someList[[2 ;; 10 ;; 3]] (*gives elements 2 through 10 in steps of 3*)

someList[[2 ;; ;; 3]] (*gives elements 2 through the end in steps of 3*)
6

Thanks. I know now.

7

crossposted: https://mathematica.stackexchange.com/questions/263639/list-letters-at-even-or-odd-numbered-positions-in-alphabet

8

Thanks a lot. I haven’t seen it before.

9

Or more elementary

FromCharacterCode /@ Range[66, 90, 2]
FromCharacterCode /@ Range[98, 122, 2]
10

Yes. It is a good idea.