MATLAB: I need to degenerate a matrix. I have 1 column with 11,2,2,2,3,3..748,749,749 ( max 5 repetitions for each integer, but random, 2340 in total), I need to select the data in the rows with the same integer value and pick one at random to give 749 r

i need to degenerate a matrix. I have 1 column with 1,1,2,2,2,3,3..748,749,749 ( max 5 repetitions for each integer, but random, 2340 in total), I need to select the data in the rows with the same integer value and pick one at random to give 749 rows

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out=cell2mat(accumarray(A(:,1),(1:numel(A(:,1)))',[],@(x) {A(x(randi(numel(x))),:)}))

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MATLAB: Select specified (max) values

You can start with sorting the array according to the first 3 columns. Then take the rows which contain a change in the 1st or 2nd column, and the last row:

S     = sortrows(A, 1:3);                       % Largest 3rd col to bottom
Index = [diff(S(:, 1)) | diff(S(:, 2)); true];  % 1st or 2nd col changes
B     = A(Index, :)                             % Extract result

MATLAB: How do i use divideblock to split the Datasets (5,749 images) in 80-20 split to obtain training and test datasets only

N = 5749;  % number of images 
idx = 1:N ;
PD = 0.80 ;
train_idx = idx(1:round(PD*N) ;     % training indices 
test_idx = idx(round(PD*N):end,:) ; % test indices

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Related Solutions

MATLAB: Select specified (max) values

MATLAB: How do i use divideblock to split the Datasets (5,749 images) in 80-20 split to obtain training and test datasets only

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