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Rand function matlab

  1. Sep 6, 2015 #1
    1. The problem statement, all variables and given/known data

    The number of iterations it takes for the product of two random numbers to produce a number less than 1e-5.
    2. Relevant equations


    3. The attempt at a solution


    while z < 1e-05
    count1 = count + 1;
    x = rand(1,1); %rand 1x1 matrix
    z = floor(a + (b-a+1) * rand(b,1));
    if z < 1e-05
    break
    end

    end


    Now I keep getting an error saying:
    Error using rand
    Size inputs must be scalar.

    Why is this?


    EDIT:

    while 2
    % randomIntegers < 1e-05
    count1 = count1 +1;
    randomIntegers = randi([-10,10],[20,1]);

    if randomIntergars > 1e-05
    break
    end

    end

    I tried this and it's still not working
     
    Last edited: Sep 6, 2015
  2. jcsd
  3. Sep 6, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Why do you want to produce random integers? I guess the random numbers are supposed to be floats between 0 and 1.
    That looks like the opposite of what you want to do.
    What does that line do? What are a and b? Why floor()?

    rand(1,1) returns a 1x1-matrix of random numbers, which is just a random number. Anyway, the inputs have to be scalar, apparently your b is not a scalar - what is b?
     
  4. Sep 6, 2015 #3
    Essentially what I want to do is generate two random numbers and their product being less than 1e-05.

    That is all in trying to do.
     
  5. Sep 6, 2015 #4

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    "Two random numbers" is too unspecific. Dice rolls give random integers between 1 and 6 - they are random numbers, but clearly not those you want here because their product is never smaller than 1.
     
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