File Exchange Pick of the Week

rand('state',5967887)

sort(ceil(rand(1,6) * 50))

ans =

     4     8    15    16    23    42

22:00 UTC | Posted in Uncategorized | Permalink | 2 Comments »

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2 Responses to “Graphical removal of data points”

1. Rommel replied on April 20th, 2007 at 01:47 UTC :
   

   Hi Doug,
   I saw this post because I was looking for a similar function that would generate random numbers and at the same time whole numbers. I am a newbie in Matlab and I checked out your statement and ran through a number of iterations and on the sixth iteration there are two numbers that are the same. This will be unlikely for lottery picks because it can only pick the numbers that are still remaining not the ones that have already been picked. I would also like to ask what does the whole number after ‘state’ do for the rand function.

2. Doug Hull replied on April 20th, 2007 at 09:12 UTC :
   

   Rommel,

   You are correct; this is not a true “lottery” simulation. It is essentially generating a vector of six uniformly distributed numbers ([0 1]) and then scaling them to [0 50] and finally rounding them up to be only integers ([1 50]). The essentially means there is ‘replacement’ between picks. It would be easy enough to use the “unique” function in MATLAB to ensure you had unique values, or you could use “randperm” to get a random permutation of the numbers and just select the first few.

   The number after ‘state’ is setting up the state of the random number generator. This is much like setting the seed. I did that because I was specifically looking to generate “4 8 15 16 23 42″ as my lottery picks.

   Thanks for the interest,
   Doug

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<pre class="code">
a = magic(3);
sum(a)
</pre>