How to make a matrix only with 2 types of numbers randomly

Hello,

It may sound a silly question but i cannot think in the desired solution. I need to make a matriz 1:24 only with values that might be 5 or 10? How can i make it randomly?

Example of the desired solution: [10 5 10 5 5 5 10 10 5 10 10 10 10 10 10 5 5 5 5 5 10 5 10 10]

Answer 1

[Wayne King]

   x = rand(24,1);
   y = zeros(size(x));
   y(x<0.5) = 10;
   y(x>0.5) = 5;

The above gives you 10's and 5's occurring with equal probability.

[Jan]

Faster and avoid the (rare) bug when x==0.5:

x = rand(24,1);
y = repmat(5, size(x));
y(x<0.5) = 10;

Answer 2

[Image Analyst]

Here's another way:

a = 5 * (randi(2, 1, 24)-1) + 5

[Image Analyst]

I hope this wasn't your homework! You didn't tag it as such. If it were I would have just given you a hint to use randi().

[André Pacheco]

Thanks it worked ;) How about if i wanted to have numbers 3 types of numbers? -100, 0 and 100?

Oh nvm, i picked up in ur solution and adapt it to my situation. so it would come: a = (randi(3, 1, 24)-2)*100

Thanks a lot ;)

[Image Analyst]

If you have the Image Processing Toolbox you can use the new imquantize() function.