Randomly select one value from an Array.

I have a 200x1 Cell Array, A, and I need to randomly select x values from that cell array. I tried using randperm in a loop but it seems to select the values in order from Array A. Also repetition is permitted.

for i=1:30

new_A=A(randperm(i))

end

[Stephen23]

"I tried using randperm in a loop but it seems to select the values in order from Array A."

That is how you wrote your code. The correct way to use RANDPERM() would be without a loop:

newA = A(randperm(200,30))

Answer 1

[the cyclist]

Here is one way to pull 30 random values (with possible repeats) from A.

randomIndex = randi(200,30,1);
new_A = A(randomIndex)

Answer 2

[Image Analyst]

No loop needed. Try this to get x cells randomly chosen from a cell array, A, of any dimensions

randomIndexes = randi(numel(A), x, 1); % Linear indexes
output = A(randomIndexes); % Extract the cells into a new cell array.

Because we're using randi() instead of randperm(), it's possible to have some cells repeated in the output.