MATLAB Central Newsreader - 5 Elements Randomly Distributed in Matrix

5 Elements Randomly Distributed in Matrix

Tim Smith — Wed, 19 Nov 2008 19:17:05 -0500

Hey everyone i hope you can help me with this problem:

I need to create a matrix where:

A% of the elements = 0
B% of the elements = 1
C% of the elements = 2
D% of the elements = 3
E% of the elements = 4

A+B+C+D+E=100%

and these values are randomly distributed throughout the matrix.

Re: 5 Elements Randomly Distributed in Matrix

dpb — Wed, 19 Nov 2008 19:31:28 -0500

Tim Smith wrote:
> Hey everyone i hope you can help me with this problem:
>
> I need to create a matrix where:
>
> A% of the elements = 0
> B% of the elements = 1
> C% of the elements = 2
> D% of the elements = 3
> E% of the elements = 4
>
> A+B+C+D+E=100%
>
> and these values are randomly distributed throughout the matrix.

If the percentages aren't random, the number of elements of each value
is fixed based on the size of the array. Simply generate a random
permutation of the array indices in 1:M*N and reshape.

--

Re: 5 Elements Randomly Distributed in Matrix

Adam — Wed, 19 Nov 2008 19:47:01 -0500

Tim Smith <imaccormick@gmail.com> wrote in message <30353534.1227122262474.JavaMail.jakarta@nitrogen.mathforum.org>...
> Hey everyone i hope you can help me with this problem:
>
> I need to create a matrix where:
>
> A% of the elements = 0
> B% of the elements = 1
> C% of the elements = 2
> D% of the elements = 3
> E% of the elements = 4
>
> A+B+C+D+E=100%
>
> and these values are randomly distributed throughout the matrix.

val = [40 30 20 5 5];
yo = [repmat(0, [1 val(1)]), repmat(1, [1 val(2)]), repmat(2, [1 val(3)]), repmat(3, [1 val(4)]), repmat(4, [1 val(5)])];

yo = reshape(yo(randperm(100)), [10 10]);

~Adam