MATLAB: How to control number of element or number of unique element in Matrix

arrayMATLABmatrix array

x= [15 30 45 60 -45 -30 0 90 15 30 45 60 -45 -30 0 90 15 45 60 -45 -30 0];%Initial guess
 a = unique(x);   % unique elements
 [countingofangles, Thetaangles]  = hist(x,unique(x));   % Unique Theta and counting of theta
  A = Thetaangles;     % Theta used in initial guess x
 c = countingofangles;     %No of theta used in initial guess x
y = repmat(x,numel(a),1);    %repeat x matrix
y(:,end) = a';           %replace last column by transpose(a)
output
 A =
   -45   -30     0    15    30    45    60    90     %Theta used in x
 c =
     3     3     3     3     2     3     3     2     %Number of theta corresponding to A
 y =
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30   -45
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30   -30
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30     0
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30    15
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30    30
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30    45
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30    60
    15    30    45    60   -45   -30     0    90    15    30    45    60   -45   -30     0    90    15    45    60   -45   -30    90
I want to eliminate/delete that row which contains no of theta/counting of theta/angles(15,30, 45 etc) less than 3

Best Answer

I'm not 100% certain I understand your question, but I think this does what you want:
y(c<3,:) = [];
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