Remove coordiantes with less than n repeats in y coordinate

Hello.

I have a set of x,y coordiantes:

I want to remove all corrdinates in which there are less than 'n' repeats in the y coordinate, Im sorry, but for once, I don't know where to start.

coords=[x,y]
        2.00          2.00
         44.53          2.00
         75.00          2.00
         20.00          3.00
         24.00          3.00
         29.00          3.00
         54.00          3.00
         69.00          3.00
         33.00          4.00
         79.00          5.00
          2.00          6.00
         60.00          6.00
         47.00          7.00
         63.00          7.00
         71.00          7.00
         34.44          8.00
         41.00          8.00
         50.00          8.00
         53.48          8.00
         68.00          8.00
         22.51          9.00
         

so if n=5, i.e. keep only coordinates in which the y value is repeated at least 5 times would give.

         20.00          3.00
         24.00          3.00
         29.00          3.00
         54.00          3.00
         69.00          3.00
         34.44          8.00
         41.00          8.00
         50.00          8.00
         53.48          8.00
         68.00          8.00
         
         

Thanks

Answer 1

[Matt J]

G=findgroups(y);

[C,~,idx]=histcounts(y, 1:max(G)+1);

keep=C(idx)>=n;

coords=coords(keep,:)

[Jason]

Thankyou