MATLAB: Maximum number of repeated values over an array

Question

Hi,

i'm working with an array of thousands of elements and i've to limit the repeated values to 10.

Let say:

a=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9];

has to become:

[0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,9].

Any suggestion would be appreciated.

Thanks in advance,

Alessandro

Answer 1

a = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9];
x = cumsum([true;diff(a(:))~=0]);
f = @(v){v(1:min(end,10))};
c = accumarray(x,a(:),[],f);
b = vertcat(c{:}).'
b = 1×28
     0     0     0     0     0     0     0     0     0     0     2     0     0     0     0     0     5     0     0     0     0     0     0     0     0     0     0     9