MATLAB: Sort a n array for maximum number of recurring values and storing the indexes corresponding to erased components

arrays

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].
And i want to store the indexes corresponding to the erased 10+-times recurrent values.
Any suggestion would be appreciated.
Thanks in advance,
Alessandro

Best Answer

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];
s=diff([inf,a])~=0;
b=ones(size(a));
b(s)=b(s)-[0,diff(find(s))];
discard=(cumsum(b)>10); %indices to discard
a_short=a(~discard) %truncated version of a
a_short = 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
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