How would I randomly pick one point from N points in MATLAB?

Question

I use this code to create and plot N points:

N = input(\'No. of Nodes:\');
data = rand(N,2); % Randomly generated n no. of nodes
x = data(:,1);
         


        

Answer 1

You can use the function RANDI to generate a random integer in a given range:

index = randi(N);             %# Generate a random integer in the range 1 to N
plot(x(index),y(index),'o');  %# Plot the point

EDIT: As pointed out by Mikhail, the RANDI function has only been available since version 7.7 (R2008b). For earlier versions, the following alternative should work:

index = ceil(rand*N);