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

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André Pacheco
André Pacheco 2012-12-18
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]

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Wayne King
Wayne King 2012-12-18
编辑：Wayne King 2012-12-18
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.
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Jan
Jan 2012-12-18
编辑：Jan 2012-12-18
Faster and avoid the (rare) bug when x==0.5:
x = rand(24,1);
y = repmat(5, size(x));
y(x<0.5) = 10;

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更多回答（1 个）

Image Analyst
Image Analyst 2012-12-18
Here's another way:
a = 5 * (randi(2, 1, 24)-1) + 5
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André Pacheco
André Pacheco 2012-12-18
编辑：André Pacheco 2012-12-18
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
Image Analyst 2012-12-18
If you have the Image Processing Toolbox you can use the new imquantize() function.

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