# Command for picking two regular elements from a Vector

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Chaudhary P Patel on 7 Jul 2023
Edited: Matt J on 7 Jul 2023
I have a vector of size 30X 1
I want to pick up 1, 2, 4 , 5, 7, 8, 10, 11, ............28, 29.
please suggest me how can i proceed?
Chaudhary P Patel on 7 Jul 2023
Moved: Matt J on 7 Jul 2023
sir, i want all the values except multiple of 3 position.

Steven Lord on 7 Jul 2023
Use randperm to create shuffled indices then use that index vector to reorder your vector of data. I'll use a deck of cards:
values = ["Ace", 2:10, "Jack", "Queen", "King"];
suits = ["club", "diamond", "heart", "spade"];
cards = combinations(values, suits);
order = randperm(height(cards)); % Random ordering of 1:52
shuffledDeck = cards(order, :); % Use order as indices into rows of cards table
Let's look at the first few cards of the two decks. First the one in order:
values suits ______ _________ "Ace" "club" "Ace" "diamond" "Ace" "heart" "Ace" "spade" "2" "club" "2" "diamond" "2" "heart" "2" "spade"
Next the shuffled deck.
values suits ______ _________ "3" "club" "8" "diamond" "3" "heart" "Jack" "club" "10" "diamond" "7" "heart" "Ace" "club" "4" "club"
While I used table arrays here (cards, shuffledDeck), the same technique (i.e. shuffledDeck = cards(order, :); ) applies to regular arrays as well.
Chaudhary P Patel on 7 Jul 2023
How it will be apply for my case?

Satwik Samayamantry on 7 Jul 2023
Hi Patel, as per my understanding you want to remove all multiples of 3 from your input vector. The following function should get your job done.
function outputVector = removeMultiplesOfThree(inputVector)
% Initialize an empty output vector
outputVector = [];
% Iterate through each element in the input vector
for i = 1:length(inputVector)
% Check if the current element is not a multiple of 3
if mod(inputVector(i), 3) ~= 0
% Append the element to the output vector
outputVector = [outputVector; inputVector(i)];
end
end
end
Hope this helps you!!
Matt J on 7 Jul 2023
Edited: Matt J on 7 Jul 2023
yourVector=randi(100,1,30) %Example
yourVector = 1×30
37 5 81 91 82 46 93 29 17 47 9 83 86 37 85 59 84 33 12 71 79 90 88 30 83 33 68 80 45 70
N=numel(yourVector);
subset=setdiff(1:N,3:3:N);
yourVector=yourVector(subset) %Result
yourVector = 1×20
37 5 91 82 93 29 47 9 86 37 59 84 12 71 90 88 83 33 80 45

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