doubt in logic vectors

Good afternoon, I have doubts to assemble this simple system, if anyone can help me with any ideas, thank you very much.
I have a basevector[0…500] numbers
I have an auxvector[1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41]

I need to read the 500 numbers in the basevector and count how many times 4 numbers in a row appear within the auxvector in the basevector.

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So there are a few ways to do it that strike to mind.

What have you tried?

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Thanks for the feedback friend, I managed to solve completely that way.

// function to count occurrences of elements in array2 in array1
function countOccurrences(array1, array2, num) {
  let count = 0;
  let contador_seis = 0;
  for (let i = 0; i < array1.length; i++) {
    if (array2.includes(array1[i])) {
	  if (count == num)
		count = 0;
		count = 0;
  return contador_seis;

function relatorio(){

let black_count_um = 0;
black_count_um = countOccurrences(basevector, black_vector, 1);

if I want to look for other numbers of numbers I just need to change the value of the variable num and call it correctly.

That will accomplish the goal.

Here’s how I did it; perhaps a bit more complex than is strictly necessary (read: Someone can do it better than me :stuck_out_tongue: ) , but…

//I'm generating some random values.
let mainarray = Array.from({length: 500}, () => Math.floor(Math.random() * 43))
//This is just "every odd number between 1 and 41"
let auxarray = Array.from({length: 20}, (i) => i*2+1))
//Create an array of 0/1's for the includes, so i dont have to do it more than once; also so i can use math.
let subarray = => auxarray.includes(x) * 1)
//Generate the result array:
return,i) => subarray.slice(i,i+4).reduce((a,b) => a+b) == 4 ? i : null).filter(n => n) 
//or if you just want to know how many times, return the .length of the above.
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