Randomly choose an element in a list and remove the chosen one for next round

Question

Hi all,

I have a list[1,2,3,4,5,6,7,8,9,10] that I want to randomly choose an element, and then remove that element from the list for the next random selection. I need to repeat the selections 4 times.

Is there a easy way to remove the selected element in the list? Both Remove and Remove From need the ith index of the elements.

Thank you for your help.

Jeff_Perkinson · Accepted Answer

Would something like this work?

theList = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j"};

while(nitems(theList) > 1, 
r=random integer(nitems(theList));

print("The chosen item was " || theList[r] || ". Element number " || char(r) || ".");

remove from(theList, r);
);

print("The chosen item is " || theList[1] || ".");

jthi · Accepted Answer

You could also use Random Shuffle to randomize the list (matrix) and then loop over the randomized list (matrix) four times or pick first four elements

Names Default To Here(1);

m = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
m_rand = Random Shuffle(m);
Show(m, m_rand);