MATLAB I need to select random 'k' number of points (pixels) from an image and display them in a k-rows and 2-column 2D array

function [points] = SelectKRandomPoints(A,k)

% this function generates a list of k randomly selected pixels from an % image

% INPUTS: A = A 3D image array from which to select points from % k = The number of points to randomly select

% OUTPUT: points = A 2D array containing k rows and 2 columns, representing % k randomly selected points (pixels).

% Author: Johnny Johnny

% loop through rows

for row = 1:k

% loop through columns

for col = 1:2

   points(row,col)=___________  %What do i do here%

end

end